Explain how sex-limited genes are inherited and give an example of this type of inheritance. What will be an ideal response?
ANSWER: Sex-limited genes are inherited by both males and females but are normally expressed only in
one sex. An example is an autosomal dominant trait that controls precocious puberty. This
gene is expressed in heterozygous males but not in heterozygous females. Heterozygous
females are unaffected but pass this trait on to half of their sons, making it hard to distinguish
this trait from a sex-linked gene. Genes that deal with traits such as breast development in
females and facial hair in males are other examples of sex-limited genes, as are virtually all
other genes that deal with secondary sexual charact
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According to the above table, the foraging
characteristic that would benefit an animal most in a stable ecology would be? a. A baby garter snake captures and eats a slug. b. A sitter because it would have more trouble adapting to a changing environment c. A forager because it has the ability to adapt quickly. d. Both the sitter and the forager are equally adept in a stable ecosystem. e. All of these would benefit an animal the most.
The number of people in the general population with type AB blood is relatively small. That is fortunate because these people make the least useful donors. Why are these people not as useful as other blood donors?
What will be an ideal response?
The action of nonsteroid hormones often results in conversion of ATP to cyclic AMP, which then functions
A) as an internal receptor for steroid hormones. B) as an enzyme in the generation of ATP. C) to initiate a cascade of enzyme activations. D) to stimulate the release of the original hormone from the cell surface receptor. E) as a secondary hormone released into the bloodstream.
Replication of the DNA occurs during
A) metaphase. B) prophase. C) telophase. D) anaphase. E) interphase.