Biology High School

Classify the examples as prezygotic or postzygotic barriers. Prezygotic barrier Postzygotic barrier Answer Bank A horse and donkey mate to produce a sterile mule. One bird species prefers open areas, whereas another bird species prefers wooded areas. One frog species mates in the spring, whereas another frog species mates in the summer. Individuals from two different species mate, but the resulting embryo dies before birth.

Answers

Answer 1

Prezygotic and Postzygotic barriers are reproductive isolation mechanisms, which avoid mating events or prevent viable and fertile mixtures between different species. Pre-zygotic barriers: One bird species prefers open areas, whereas another bird species prefers wooded areas. One frog species mates in the spring, whereas another frog species mates in the summer. Postzygotic barrier: A horse and donkey mate to produce a sterile mule. Individuals from two different species mate, but the resulting embryo dies before birth.

What is reproductive isolation?

This is a mechanism through which different species or populations do get to mate and produce fertile offspring. This mechanism allows the accumulation of genetic differences and favors speciation.

Different barriers inhibit or interrupt the genetic flow between species.

Reproductive barriers are isolation mechanisms that prevent mating between two or more species. There are two types of barriers,

prezygotic ⇒ that avoids fertilization between individuals of different species,

postzygotic ⇒ that impedes the zygote from developing and reaching the adult stage.

Pre-copulatory or pre-zygotic barriers include:

Ecological or by habitat isolation; Seasonal or temporal; Sexual o ethologic; Mechanic; Gametes incompatibility.

Postzygotic mechanisms barriers include:

Hybrid inviability, Hybrid sterility, Hybrid reduced viability or fertility, Cytoplasmic interactions.

Examples,

Pre-zygotic barriers

One bird species prefers open areas, whereas another bird species prefers wooded areas (Ecological or by habitat isolation)

One frog species mates in the spring, whereas another frog species mates in the summer (Seasonal or temporal isolation)

Postzygotic barrier

A horse and donkey mate to produce a sterile mule (Hybrid sterility).

Individuals from two different species mate, but the resulting embryo dies before birth (Hybrid inviability).

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Related Questions

which bones unite to form the highlighted bone?

Answers

The highlighted bone is named the sternum. The sternum, which lies in the middle of the chest, is where the ribs connect to the body.

Which joint does the humerus's highlighted bone form?

The humeral head's ball and glenoid's socket connect at the glenohumeral joint. The supraspinatus, infraspinatus, teres minor, and subscapularis muscles' tendons make up the rotator cuff, which joins the humerus to the scapula. Muscle and bone are joined via tendon.

What develops in the indicated curvature?

When a child is able to sit up on their own, the lumbar curvature that is highlighted begins to develop. The structure in bold allows for head lateral rotation. The structure in bold allows for head lateral rotation.

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