Which of the following is an example of a homozygous recessive genotype?
A. ab
B. short
C. aa
D. AA
E. Aa
Answer: C
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A. atoms. B. neutrons. C. electrons. D. molecules. E. protons.
Which of the following cells is responsible for rejection of transplanted organs?
a. NK cells b. cytotoxic T cells c. helper T cells d. memory cytotoxic T cells
The leopard seal's primary predator is called the:
a. sperm whale. b. polar bear. c. killer whale. d. salt water crocodile. e. Weddel seal.
Mendel selected seven traits in pea plants to study. Why were his results relatively easy to interpret, even though he was examining seven distinct traits?
a. All seven traits were easy to characterize. b. The seven alleles segregated independently from each other. c. Peas are easy to raise and have short life cycles. d. He knew enough mathematics to apply rules of probability to his results.