If natural selection is real, why do lethal recessive disorders still exist in populations?
A. Recessive disorders most frequently do not manifest until later in life, after the individual
has reproduced.
B. Recessive alleles remain hidden in carriers who are not affected by the disorder.
C. There may be an advantage to individuals who are heterozygous.
D. Recessive disorders most frequently do not manifest until later in life, after the individual
has reproduced; and recessive alleles remain hidden in carriers who are not affected by the
disorder.
E. Recessive alleles remain hidden in carriers who are not affected by the disorder; and there
may be an advantage to individuals who are heterozygous.
E
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A lab technician is preparing to dispose of a rat and a frog that were euthanized earlier in the day for a scientific study. Although the two animals died at the same time, the rat has rigor mortis while the frog does not yet show any signs of it. What is the best explanation for this time difference in the onset of rigor mortis?
A. The rat has higher concentrations of myoglobin in its muscles than the frog. B. All the frog's muscles are fast-twitch muscles. C. The rat's muscles have a greater density of myofilaments than the frog's muscles. D. The frog has lower concentrations of glycogen in its muscles than the rat. E. The rat is able to synthesize more ATP than the frog. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about rigor mortis? What other information is related to the question? Choose Answer · Given what you now know, what information is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The unique characteristics of an individual's iris pattern may be compared to the unique characteristics
of a person's a. facial features. b. height and weight combination. c. fingerprints. d. hair color. e. hair pattern.
Approximately how many years ago did humans of the genus Homo first inhabit eastern Africa?
a. 6 million b. 4 million c. 3 million d. 2 million e. 1 million
The use of traditional cross-breeding in developing breeds with desired characteristics is limited by __________
A. the short generation times of animals. B. large litter sizes. C. whether individuals with the desired traits will inter-breed. D. traits with specific inheritance patterns. E. traits that are controlled by a single gene.