Farmers have selected for increased oil content from corn. For a long time, the plants responded with steadily increasing oil content, but recently the response slowed and then stopped. When this line of corn is crossed to another line and the hybrids are selected, the oil content resumed its climb. What is a plausible reason for the lack of response?
A. The environmental conditions improved.
B. The genetic variation for the trait was exhausted.
C. There was too much genetic variation for the trait.
D. The environmental conditions deteriorated.
E. Artificial selection is different than natural selection.

Answers

Answer 1

Answer:

B. The genetic variation for the trait was exhausted.

Explanation:

Oil content is a quantitative trait, ie., a phenotypic feature that depends on the accumulative effects of many genes and the interaction of a genotype with its environment. During crop improvement, the plants (i.e., lines) containing desired alleles involved in the variation of this trait will be selected, thereby increasing oil content but simultaneously decreasing the genetic variation of the population. In consequence, after successive rounds of artificial selection, lines will not have sufficient genetic diversity to be again selected for this trait.


Related Questions

11. During photosynthesis, the proteins Inside
chloroplasts in plant cells absorb energy
from the Sun. Which statement best
describes how photosynthesis follows the
law of conservation of energy?
A. Electrical energy from the Sun is converted
into light energy in plant cells.
B. Light energy from the Sun is converted
into chemical energy in plant cells.
C. Nuclear energy from the Sun is
converted into kinetic energy in plant
D. Chemical energy from the Sun is converted
into thermal energy in plant cells,

Answers

Answer:

B

Explanation:

just cause it is i think

Answer:

The answer is B

Explanation:

Use the process of elimination, It is fairly obvious it's not C yeah? so mark C off. D talks about thermal energy which is completely and utterly wrong. Your now left with A and B. There is no electrical energy in plants so B is your answer

what is meant by the term VO2 max

Answers

Answer:

VO2 max is the maximum volume of oxygen you can consume per minute per kilogram of body weight at your maximum performance. VO2 max is an indication of aerobic fitness and should increase as your level of fitness improves.

Answer:

VO2 is the maximum oxygen uptake.

Explanation:

VO2 is the maximum oxygen consumption during incremental exercise.

Can you combine an apple and an orange to make a cross hybrid fruit? (Not sure this classify as biology)

Answers

Answer:

No

Explanation: Apples and Oranges are different species, therefore they are unable to interbreed. This would only be possible by gene splicing (Gene splicing is a form of genetic engineering where specific genes or gene sequences are inserted into the genome of a different organism) which is incredibly difficult.

what must happen before miosis can begin?

Answers

Answer:

Before meiosis actually begins, the DNA that is packaged into chromosomes must be fully copied. ... DNA replication occurs in the same fashion as it does during mitosis. After replication, the homologues are doubled, and each chromosome now has a homologous pair

1) State three economic importance of Amoebiasis,​

Answers

Answer:

An amoeba's economic value can be found in medicine and nutrient recycling. According to Biology Reference, certain amoeba species can cause sickness and death, while others are important in maintaining healthy ecosystems because they recycle the nutrients needed by bacteria and keep the bacterium population under control.

OAmalOHopeO

Please help me please!!
(Picture above)

Answers

Pont A 30,30
Point B 15,60
Point c 0,80
Point D 15,30
Point E 30,70
Point F 60,90
Point G 0,0
Point H 45,120
Point I 30, 150
Point J. 75, 20

WILL MARK BRAINLIEST! :)
Diversity occurs in many places in meiosis. In what process is the first place where the pieces of DNA switch positions with the homologous sister chromatids?

A. Interphase

B.Independent Assortment

C. Crossing Over

D.Anaphase

E. Randomness of egg and sperm meeting

Answers

Answer:

crossing over

Explanation:

I had it on a bio exam. i got it right

The modern industrial agricultural practice that has resulted in high yields but with a loss in biodiversity is:

Answers

Answer: Monoculture

Explanation:

One type of crop at a time in one specific field. "Mono" means one.

the fundamental explanation for the cause of cancer is that

Answers

Answer:the fundamental explanation for the cause of cancer is that

Explanation:

Answer:

A:Cell replication becomes uncontrolled

Explanation:

Definition of cancer: A disease in which abnormal cells divide uncontrollably and destroy body tissue.

Ann is looking at the night sky. There is a first-quarter moon. What does she
see? *
a moon shaped like a crescent
a moon shaped like a half circle
a moon shaped like a circle, shining brightly
no moon in the sky

Answers

Answer:

A Moon shaped like a half circle

Explanation:

Answer:

a moon shaped like a half circle

Explanation:

Why is the mitochondria important in cellular respiration?

Answers

Answer:

Mitochondria have an important role in cellular respiration through the production of ATP, using chemical energy found in glucose and other nutrients. Mitochondria are also responsible for generating clusters of iron and sulfur, which are important cofactors of many enzymes.

Explanation:

it's often referred to as the "powerhouse"

Answer:

Mitochondria have an important role in cellular respiration through the production of ATP, using chemical energy found in glucose and other nutrients.

Explanation:

!!!!PLEASE HelP!!!!
A farmer has decided to dig an artesian well into the unconfined aquifer below his crops. However, water does not fill his well. Why isn't his well working?
A. An artesian well needs the pressure of a confined aquifer
B. An artesian well must be near a lake
C. An artesian well must be near the site of groundwater infiltration
D. An artesian well only works in areas that are going through a drought

Answers

Answer:

it is a

Explanation:

i did the test

A farmer has decided to dig an artesian well into the unconfined aquifer below his crops. His well is not working because an artesian well needs the pressure of a confined aquifer. The correct option is A.

What is an aquifer?

An artesian well is a deep tube well drilled underground to gather water for human usage. This good type is found in restricted aquifers.

The artesian well differs from the others in that it does not require the use of a pump to raise the water, as the cistern does. The sort of subsurface reservoir causes the water that travels through the tube to naturally spurt to the surface.

The underground reservoir with the qualities required for drilling an artesian well is the product of extremely specialized geological conditions. Gushing wells are caused by the restricted aquifer, as this sort of deep groundwater is known. This type of reservoir is found between impermeable subsurface layers.

Therefore, the correct option is A. An artesian well needs the pressure of a confined aquifer.

To learn more about aquifers, refer to the link:

https://brainly.com/question/14916917

#SPJ2

The Rh factor is also known as the
antigen.
A. monoclonal
B. polyclonal
C. D
D. X
E. AB

Answers

Answer:

Explanation:

Option E is the correct answer

Answer:

C. D

Explanation:

RBCs that are Rh positive express the one designated D (RhD antigen).

-TheUnknownScientist

Zacharias Jansen was known for being a spectacle maker and is credited with making the 1st
microscope.
True or False?

Answers

Answer:

True

Explanation:

Zacharias Jansen was known for being a spectacle maker and is credited with making the 1st microscope!

Which is(are) a key role (or roles) of most family therapists?

Answers

a key role is that u can have ur family therapists to talk to for free

A scientist is developing a potential treatment for cancer. She grows cells in hundreds of petri dishes and exposes the dishes to environments that are known to cause cancer. After exposure, the scientist determines that some of the petri dishes have cancer cells.What factor do all the petri dishes that contain cancer cells have in common?

Answers

Answer:

they are normal mutations you can never have a cure to cancer you would have to throw a lot of your DNA and genes away to have a less chance of dying but we could slow or kill cancer but no way to prevent it from happning as it happens everyday to you but those cells have a higher chance to become cancer becuase of those thing that help cells to become cancer.

Explanation:

Which type of mutation does not change the amino acids produced?

Answers

Silent mutation: Silent mutations cause a change in the sequence of bases in a DNA molecule, but do not result in a change in the amino acid sequence of a protein (Figure 1).

Answer: Silemt Mutation

Explanation:

A-pex

how do i turn off the internet while choking bart simpson

Answers

Answer:

good question, you don't. Or simply wait untill you finish choking bart

Brainliest Which of the following best explains how most plants grow? *


Plants store the excess oxygen they produce, resulting in them gaining mass

Plants store the excess glucose they produce, resulting in them gaining mass

Plants store the excess carbon dioxide they produce, resulting in them gaining mass

Plants store the excess water they produce, resulting in them gaining mass

Answers

Answer:

plants store the glucose they produce, resulting in them gaining mass. that should be the correct answer

HELP!!!! Two characteristics of most plants are a root system and a shoot system. Most of the structures in these systems
are common to all plants; however, there are some variations. Which structure can sometimes be found as part of
the shoot system?
stems
leaves
roots
flowers

Answers

Answer:

Leaves, and flowers

Explanation:

The shoot system is above ground and includes the organs such as leaves, buds, stems, flowers (if the plant has any), and fruits (if the plant has any).

Answer:

ROOTS

Explanation:

ROOT ROOT ROOT ROOT ROOT ROOT because it root

The graphs show the reaction rate for an enzyme across a range of temperatures and pH. Based on these data, this enzyme functions best at what temperature and pH? *

Answers

The graph is attacged and the options is as follows:

Temperature of 27oC and a pH of 4

Temperature of 37oC and a pH of 6

Temperature of 40oC and a pH of 8

Temperature of 50oC and a pH of 10

Answer:

The correct answer would be - temperature of 37oC and a pH of 6

Explanation:

The graph 1 shows the relation between the rate of reaction for an enzyme and the temperature of  reaction is been represented. In this graph the rate of eaction is highest (point from the slope starts decreasing) at the So, by the options and graph the temperature 37°C(Below 40°C) rate of reaction is maximum.

Similarly, in other graph rate of reaction and and pH has been represented in which rate of reaction is maximum at pH 6. after 6 pH the rate of reaction started decreasing.

Which describes a eukaryotic cell, but not a prokaryotic cell?

A: is surrounded by a cell membrane

B: makes and uses proteins

C: contains DNA in a nucleus

Answers

Answer:

c?

Explanation:

eukaryotes have a nucleus and prokaryotes do not

Answer:

C.) Contains DNA in a nucleus

Explanation:

There are several differences between the two, but the biggest distinction between them is that eukaryotic cells have a distinct nucleus containing the cell's genetic material.

which of the following environmental conditions will have a negative effect on a population

Answers

you didnt give the list of answers

Explanation:

Will the coronavirus increase the importance of environmental sustainability?

Answers

Answer:

It will.

Explanation:

environmental conditions affect the stability of severe acute respiratory syndrome coronavirus 2 in nasal mucus and sputum. The virus is more stable at low-temperature and low-humidity conditions, whereas warmer temperature and higher humidity shortened half-life.

What is the reason for the increased number of drug resistant bacteria being found in hospitals?

Answers

Answer: This rise is related to their natural resistance to most commonly used antibiotics and their capacity to acquire resistance to other antibiotics either by mutation (penicillins) or by transfer of resistance genes on plasmids and transposons (aminoglycosides and glycopeptides).

Explanation:

Please help!!!!!!!!!!!!!
Some organisms, such as bacteria, reproduce asexually; whereas, other organisms reproduce
sexually. Which statement correctly states why one type of reproduction is beneficial over the
other?
A. Asexually reproduced offspring are more genetically diverse.
B. Asexual reproduction produces offspring genetically different from parents.
C. Sexual reproduction can produce a large number of offspring very quickly.
D. Sexual reproduction produces organisms that are genetically diverse.

Answers

Answer:D

Explanation: A isn't right because during asexual reproduction there is no exchange of genetic characteristics thus the offsprings retain the genetic characteristics of their parents and there is no diversity.

Sexual reproduction on the other hand involves the fusion of gametes and the exchange of genetic characteristics thus the offsprings are diverse and are not identical to their parents as is the contrary in asexual reproduction.

Sexual reproduction produces organisms that are genetically diverse.

Sexual reproduction involves the combination of chromosomes from both parents. This combination of chromosomes introduces variation into the population. This combination does not occur in asexual reproduction.

Hence, the statement that correctly states why one type of reproduction is beneficial over the  other is that sexual reproduction produces organisms that are genetically diverse.

Learn more: https://brainly.com/question/4100787

Which best describes the process of evaporation/transpiration in the
water cycle?
O A. Water from the ocean enters the atmosphere as water vapor.
O B. Water on the surface of Earth enters the groundwater supply.
C. Water vapor in the atmosphere returns to the surface of Earth as
liquid water.
O D. Water on the surface of Earth and water lost by plants enters the
atmosphere as water vapor.

Answers

Answer:

A

Explanation:

Answer:

The answer is D

Explanation:

Water on the surface of Earth and water lost by plants enters the atmosphere as water vapor

The person above me is wrong I tried it and it was wrong and I tried D and I got it correct

suggest two factors other than the rate of nitrogen fixation that may affect the avality of nitrogen in the marine ecosystem

Answers

Answer: run off from land/rivers and phytoplankton blooms

Explanation:

Nitrogen, particularly as nitrate is easily leached from soil. Human agriculture relies on fertilisers with significant nitrate content that applied at levels higher than it can be used. The balance end up as runoff, much of which ends up in

The two factors that are other than the rate of nitrogen fixation that fit the marine ecosystem are runoff from the land or rivers and the phytoplankton blooms

Waht is nitrogen fixation ?

Nitrogen fixation refers to the chemical process by which molecule N2 has a strong Tripple covalent bond and in the air, it gets coveted into NH3 or a related nitrogenous compound that is typically in soil or aquatic system.

The fixation is essential for life as inorganic nitrogen compounds are needed for the biosynthesis of nitgen-containing organic compounds like amino acids.

As nitrogen is easily found in soil and can be added by fertilizers it ends as runoff and damages the ecosystem.

Find more information about the marine ecosystem.

brainly.com/question/2305178

would an electric eel be able to shock predators if its cells run low on ATP?

Answers

Answer: no.

Explanation:

No because it would need to run energy to be able to shock its predators

which kind of cells carry out the process of cellular respiration?

Answers

All living cells must carry out cellular respiration. It can be aerobic or anaerobic respiration. Prokaryotic cells carry out cellular respiration within the cytoplasm or on the inner surfaces of the cells, while Mitochondria carry out the cellular respiration in eukaryotic cells. They are also called as the 'Power house' of the cell as they produce the energy needed to the cell to function properly.

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