A recessive allele on the X chromosome is responsible for red-green color blindness in humans. A woman with normal vision whose father is color blind marries a color-blind male
What is the probability that this couple's first son will be color blind? A) 1/4
B) 1/2
C) 2/3
D) 3/4
B
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All of the following are second messengers except
A) calcium ions. B) IP3. C) DAG. D) cameleons. E) PDGF.
The molecule in the accompanying figure is glyceraldehyde, an example of a ____ sugar
a. triose b. hexose c. pentose d. heptose e. tetrose
How did the researchers estimate that the original FOXP2 mutation happened 300,000–400,000 years ago?
A. by examining the fossil record B. They found the mutation in chimpanzee DNA. C. They found the mutation in Neandertal DNA. D. They found the mutation in 300,000-year-old human remains. E. using a molecular clock
The type of epithelial tissue that forms a single layer of cube-shaped cells is
A. simple squamous. B. simple cuboidal. C. stratified cuboidal. D. simple columnar. E. stratified columnar.