In humans, germ cells are located in
a)bone marrow.
b)blood.
c)all cells.
d)all tissues.
e)testes and ovaries.
e)testes and ovaries.
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A newborn is identified as having sickle-cell anemia. While both parents are healthy, a screening of both parents will most likely reveal:
A. both mother and father are carriers of a mutant ? chain gene. B. only one parent has a mutant ? chain gene since mutation is dominant. C. both mother and father are carriers of a mutant ? chain gene. D. only one parent has a mutant ? chain gene since mutation is dominant. E. both parents carry a mutant hemoglobin gene and are highly susceptible to malaria.
How many genes are generally found for every million bases of DNA?
A. 10 B. 100 C. 1,000 D. 10,000 E. 100,000
Most seeds are dormant until
a. conditions are favorable. b. drastic conditions are present. c. the timing is right. d. conditions are favorable and the timing is right
Which of the following describes the function of the coelom?
a. housing the circulatory system of triploblasts b. digesting and storing nutrients for diploblasts c. facilitating reproduction in all animals d. developing connective tissue in most animals