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Mendel’s experiments with pea plants yielded useful results because

• pea plants show discontinuous variation and complete dominance
• pea plants exhibit continuous variation
• pea plants exhibit a variety of inheritance patterns
• peas plants are sterile
• peas plants express genetic heterogeneity

The penis and the clitoris both develop from the embryonic genital tubercle. This is possible due to the direct influence of ______________.

• the Y chromosome
• estrogen
• the X chromosome
• androgens
• SRY gene

Most single gene defects that affect human behavior do so

• by affecting muscle metabolism
• by gene action that takes place only in the adult stage of life
• by affecting the digestive system
• through their action on the structure, development, or function of the nervous system
• by having only subtle effects on the nervous system

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