Question

Which of the following is not a potential prezygotic reproductive barrier? a. Temporal segregation of breeding seasons b. Differences in chemicals that attract mates c. Hybrid infertility d. Spatial segregation of mating sites e. Sperm that cannot penetrate an egg

Name: Problem 2, Chapter 23: Life: The Science of Biology
Uploaded: 2020-06-04T21:49:15-08:00
Duration: 51 s
Channel: Aditya Sood
Description: Which of the following is not a potential prezygotic reproductive barrier? a. Temporal segregation of breeding seasons b. Differences in chemicals that attract mates c. Hybrid infertility d. Spatial segregation of mating sites e. Sperm that cannot penetrate an egg

   Which of the following is not a potential prezygotic reproductive barrier?
a. Temporal segregation of breeding seasons
b. Differences in chemicals that attract mates 
c. Hybrid infertility
d. Spatial segregation of mating sites
e. Sperm that cannot penetrate an egg

Life: The Science of Biology

David Sadava, David… 10th Edition

Chapter 23, Problem 2

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Solved by Expert Aditya Sood

06/04/2020

Step 1

Prezygotic barriers are those that prevent the formation of a zygote, which is the first stage of a developing offspring. These barriers can be due to differences in mating seasons (temporal segregation), differences in mating signals (chemicals that attract Show more…

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Which of the following is not a potential prezygotic reproductive barrier? a. Temporal segregation of breeding seasons b. Differences in chemicals that attract mates c. Hybrid infertility d. Spatial segregation of mating sites e. Sperm that cannot penetrate an egg

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Key Concepts

Reproductive Isolation

This is the broader concept encompassing both prezygotic and postzygotic barriers. It refers to any set of mechanisms that prevent gene flow between populations, thereby maintaining species integrity and facilitating speciation over evolutionary time.

Postzygotic Reproductive Barriers

These are factors that reduce the viability or reproductive capacity of hybrid offspring after fertilization has occurred. An example is hybrid infertility, where hybrids are formed but cannot reproduce, thereby limiting gene flow between species.

Prezygotic Reproductive Barriers

These are mechanisms that prevent different species from mating or successfully fertilizing even when they encounter each other. Key examples include differences in mating behaviors, timing of reproduction, habitat preferences, and incompatibilities at the gamete level—all occurring before a zygote can form.

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