. Which of the following is a correct statement about gametes?

2. Which of the following is a correct statement about gametes?
A. Gametes are the result of the uniting of the sperm and the ovum at fertilization.
B. Gametes are created with twice the usual number of chromosomes.
C. Gametes are formed through a cell division process called mitosis.
D. Gametes are formed through a cell division process called meiosis.

3. Even tiny amounts of _______ in the paternal bloodstream cause a dramatic change in the sex ratio of offspring.
A. dioxin B. lead
C. PCBs
D. mercury

4. Characteristics that vary on a continuum among people, such as height, weight, intelligence, and personality, are due to
A. polygenic inheritance.
B. dominant–recessive relationships.
C. genomic imprinting.
D. incomplete dominance.

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