Populations of bay checkerspot butterflies that occupy large patches of suitable habitat serve as sink
populations for individuals that recolonize small patches of suitable habitat where butterfly
populations frequently become extinct.
Indicate whether the statement is true or false.
ANS: F, source
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MPF is a
a. monomeric protein kinase. b. dimer of two molecules of Cdk1. c. dimer of Cdk1 and cyclin A. d. dimer of Cdk1 and cyclin B.
Suppose a new mutation that improves metabolic efficiency is lost from a small population of mammals living in a region of seasonal food scarcity after a hurricane eliminates half the mammal population. This is an example of
A) directional selection. B) stabilizing selection. C) disruptive selection. D) sexual selection. E) genetic drift.
Why are cells arrested at metaphase in the preparation of a karyotype?
a. The chromosomes have duplicated, making them easier to visualize. b. All of the sister chromatids have separated into two new daughter cells. c. All of the chromosomes are at their least condensed state and are easy to visualize. d. All of their chromosomes are highly condensed and easy to visualize.
If a child belonged to blood type O, he or she could not have been produced by which set of parents?
a. A and B b. A and O c. AB and O d. O and O