What is one explanation for why more boys than girls are conceived?
A. The X sex chromosome swims faster than the Y sex chromosome.
B. The Y sex chromosome swims faster than the X sex chromosome.
C. There are more X sex chromosomes than Y sex chromosomes.
D. There are more Y sex chromosomes than X sex chromosomes.
Answer: B
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Which of the following is NOT a taste receptor on the tongue?
a. sweet b. sour c. vegetable d. umami
The text suggests that, from a genetic point of view, the concept of race is:
a. very important, since there are many genes in the human genome that determine specific race-related traits (such as hair color and eyelid shape) b. largely meaningless, and a better way of thinking about race differences is to consider them as cultural or ethnic differences c. very important, since in humans there are only a handful of genes that code for "race" in our DNA (each corresponding to a difference racial group) d. of some importance, since genes that code for racial characteristics also code for intelligence
One parent can produce about ___ different combinations of chromosomes, and the two together can produce about ___
a. 8 million, 60 to 70 trillion b. 100 million, 250 trillion c. 2 billion, 750 trillion d. 1 million, 6 trillion