Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 20.2, Problem 1CC
Is this an example of a prezygotic or a postzygotic isolating mechanism?
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What is the key difference between prezygotic and postzygotic isolating mechanisms? Give an example of each type. Which type is more costly from the perspective of energy?
Would each of the following examples of reproductive isolation be considered a prezygotic or postzygotic mechanism?
A. Horses and donkeys can interbreed to produce mules, but the mules are infertile.
B. Three species of the orchid genus Dendrobium produce flowers 8 days, 9 days, and 11 days after a rainstorm. The flowers remain open for 1 day.
C. Two species of fish release sperm and eggs into seawater at the same time, but the sperm of one species do not fertilize the eggs of the other species.
D. Two tree frogs, Hyla chrysoscelis (diploid) and Hyla versicolor (tetraploid), can produce viable offspring, but the offspring are sterile.
What are prezygotic and postzygotic barriers? Discuss the concept.
Chapter 20 Solutions
Principles of Biology
Ch. 20.1 - Prob. 1CCCh. 20.1 - Prob. 1TYKCh. 20.1 - Prob. 2TYKCh. 20.2 - Prob. 1BCCh. 20.2 - Is this an example of a prezygotic or a...Ch. 20.2 - Is this an example of a prezygotic or a...Ch. 20.2 - Prob. 1TYKCh. 20.2 - Which of the following is not an example of a...Ch. 20.3 - Prob. 1BCCh. 20.3 - Prob. 1CC
Ch. 20.3 - Which of the following is an example of allopatric...Ch. 20.3 - Prob. 2TYKCh. 20.4 - Prob. 1CCCh. 20.4 - Prob. 2CCCh. 20.4 - Prob. 1TYKCh. 20 - Macroevolution refers to evolutionary changes that...Ch. 20 - Prob. 2TYCh. 20 - Prob. 3TYCh. 20 - Prob. 4TYCh. 20 - Prob. 5TYCh. 20 - Prob. 6TYCh. 20 - Prob. 7TYCh. 20 - Prob. 8TYCh. 20 - Prob. 9TYCh. 20 - Evolutionary changes in the rate or timing of...Ch. 20 - Prob. 1CCQCh. 20 - Compare and contrast different mechanisms of...Ch. 20 - A principle of biology is that populations of...Ch. 20 - Prob. 1CBQCh. 20 - Discuss the type of speciation (allopatric or...
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- List the barriers that prevent interbreeding and give an example of each.arrow_forwardDistinguish between prezygotic and postzygotic isolating mechanisms, and provide an example of each.arrow_forwardDescribe two mechanisms that can decrease gene flowin sympatric populations, thereby making sympatricspeciation more likely to occur.arrow_forward
- What long-term effects can gene flow have on any two populations that are exchanging genes? View keyboard shortcutsarrow_forwardGive disadvantages of continuous inbreedinng?arrow_forwardBehavioral isolation is considered which type of reproductive barrier? a prezygotic b postzygotic c overlapping d heritablearrow_forward
- Suppose in a certain population there are 100 individuals homozygous for the A1 allele, 400 individuals homozygous for the A2 allele, and 500 heterozygous individuals. What are the genotype frequencies? What are the allele frequencies?arrow_forwardWhat are prezygotic and postzygotic barriers?arrow_forwardWhat would a study of both monozygotictwins raised together and monozygotictwins raised apart tell you about environmentalinfluences?arrow_forward
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