Which is an example of a postzygotic isolating barrier? a....

Which is an example of a postzygotic isolating barrier? a. The genitalia of a male duck that do not fit properly with the genitalia of females of another population. b. Females of one kind of fly that are not attracted to the buzz of another kind of male. c. Two species of bats breeding in different habitats. d. The hybrid offspring of two species of crocodiles that can produce normal gametes but cannot obtain a mate.

Which is an example of a postzygotic isolating barrier?
a. The genitalia of a male duck that do not fit properly with the genitalia of females of another population.
b. Females of one kind of fly that are not attracted to the buzz of another kind of male.
c. Two species of bats breeding in different habitats.
d. The hybrid offspring of two species of crocodiles that can produce normal gametes but cannot obtain a mate.

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Key Concepts

Reproductive Isolation

Reproductive isolation refers to a collection of mechanisms that prevent gene flow between distinct species or populations. These mechanisms ensure that even if species come into contact, their genetic lineages remain separate, which is crucial for maintaining species identity and can eventually lead to speciation.

Postzygotic Isolation

Postzygotic isolation refers to barriers that occur after fertilization, adversely affecting the viability or reproductive capability of the resulting hybrid offspring. These barriers include reduced hybrid fitness, hybrid sterility, or hybrid inviability, which act to limit the transfer of genetic material between species even after a zygote has formed.

Hybrid Sterility

Hybrid sterility is a form of postzygotic isolation where the hybrid offspring, despite being viable, are unable to produce offspring of their own. This prevents successful gene flow between the parent species, reinforcing species boundaries even when initial hybridization occurs.

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