A male is heterozygous for the trait that produces freckles on the skin, and he has freckles. If he marries a woman who is also heterozygous for freckles, ________ of their children are predicted to be freckled. Also, of all their children, ________ are predicted to be heterozygous.
A. 100%; 100%
B. 75%;50%
C. 75%; 25%
D. 100%; 75%
E. 50%; 50%
Answer: B
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Which one of the following statements is true of the 32 allele in the CCR5 gene? (Choose all that apply)
A. It codes for a mutant protein that is completely inactive. B. It leads to a deletion which maintains the reading frame. C. It provides some protection against HIV progression to AIDS in both its heterozygous and homozygous forms. D. It is an example of a beneficial mutation. E. It affects the attachment of HIV to an animal cell by altering one of the viral proteins.
A structure used in rapid escape or pursuit is
indicated by letter a. A. b. B. c. C. d. D. e. E.
Pepsinogen catalyzes the hydrolysis of proteins to short polypeptides. Indicate whether the statement is true or false
Which parts of a flower are most likely to have distinctive colours, patterning, and shapes for attracting pollinators?
a. the petals b. the receptacles c. the sepals d. the stamens