A reproductive barrier that prevents mating or fertilization of a zygote between

Question

A reproductive barrier that prevents mating or fertilization of a zygote between species: a. Postzygotic Barrier b. Reduced Hybrid Viability c. Reduced Hybrid Fertility d. Prezygotic Barrier The Founder Effect is a mechanism of: a. Genetic Drift b. Gene Pool c. Gene Flow d. Evolution What is relative fitness? a. The contribution an individual makes to the gene pool of the next generation relative to the contribution of other individuals. b. a shift in the overall makeup of a population by selecting in favor of one extreme phenotype. C. A population that may gain or lose alleles when fertile individuals move into out of the population d. None of the above. Temporal isolation is what kind of reproductive barrier: (a) Time barrier, ie Different mating seasons b. Barrier based on different habitats c. Incompatible gamete barrier d. None of the above. What was Darwin's "Boldest Claim" ?: a. That man descended from monkeys b. That all forms of life are related to some extent through branching evolution from the earliest organisms c. That natural selection is the "bee's knees." d. Humans will not survive long enough to evolve due to their "humanity."

Explanation / Answer

The answer is the pre-zygotic barrier as it prevents mating or fertilization.

The process is called reproductive isolation and is intended to prevent cross species breeding.

1. The first barrier in reproductive isolation is called pre-zygotic barrier (prevents the formation of an embryo).

This includes behavioral or sexual isolation where different species often fail to recognize a mating call between incompatible species. Mating rituals are usually in 2 or more stages and this barrier prevents incompatible species to proceed into further stages of mating.

2. If mating occurs, the second barrier is called the post-zygotic barrier where the fertilized embryo fails to develop (development stops at various stages in depending on species)

These mechanisms are in place to prevent the development of an individual with reduced viability.

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