Suppose that R is the dominant allele for a round pea, and r is the recessive allele for a wrinkled pea. Suppose also that you cross plants having round peas with plants having wrinkled peas. Which of the following is the most likely result?
a. The offspring will be neither round nor wrinkled.
b. The offspring will be mostly wrinkled.
c. The offspring will all be wrinkled.
d. The offspring will all be round.
Answer: d. The offspring will all be round.
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The mouse is a particularly useful model for studying human disease because _____
a. mice and humans are 100% genetically identical b. all mice are in essence, clones c. mice do not feel pain and discomfort d. mice and humans are the only species whose genomes have been sequenced e. approximately 90% of human disease-associated genes are present in the mouse genome
Paired homologous chromosomes are found at the center of the cell during _____ of meiosis
a. metaphase I b. telophase I c. prophase II d. metaphase II
e. anaphase IIA predictably recurring time when the female
becomes sexually receptive to the male in most mammals is a. estrus. b. endometrium. c. menstruation. d. coitus. e. parturition.
The type of support illustrated in Figure 40-2 is:
a. a hydrostatic skeleton. b. an exoskeleton. c. the integumentary system. d. a shell. e. the dermis.