Two linked genes, (A) and (B), are separated by 36 m.u. A man with genotype Aa Bb marries a woman who is aa bb. The man's father was AA BB. What is the probability that their first child will be Aa bb?
A. 18%
B. 9%
C. 25%
D. 36%
E. 50%
Ans: A. 18%
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Which of the following is true concerning a somatic cell mutation?
A. A small fraction of the gametes carry the mutation. B. Half of the gametes carry the mutation. C. All of the gametes carry the mutation. D. Only a small group of cells within the organism is affected by the mutation. E. All cells within the organism are affected by the mutation.
Which of the following is the least inclusive level in the taxonomical hierarchy?
a. kingdom b. phylum c. genus d. species
Pleiotropic genes
a. act on secondary sexual characteristics. b. influence more than one aspect of phenotype. c. are additive. d. produce lethal effects when homozygous. e. cannot be inherited.
Which statement about biological clocks is FALSE?
a. They are limited to vertebrates. b. They are regulated by clock proteins that act both within and outside the nervous system. c. They have complex feedback loops. d. They are controlled by genes. e. They are capable of sustaining biological rhythms independently of environmental cues.