Complex quantitative traits often show
A) only one discrete phenotype.
B) a distribution with a large proportion of individuals at the two extremes.
C) a normal distribution with an equal number of points above and below the mean.
D) a normal distribution with an equal number of points at each value within the range.
C) a normal distribution with an equal number of points above and below the mean.
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Refer to Figure 30-1. The tissue layer labeled 5 will give rise to the:
a. skeletal system.
b. muscles.
c. circulatory system.
d. lining of the digestive system.
e. nervous system.
A 40-year-old patient has been diagnosed with cancer. Sequencing of cancer cell genomes reveals a high frequency of G/C to A/T base pairs conversion. The DNA repair system that is most likely deficient in this patient is the
A) base excision repair pathway. B) SOS repair pathway. C) nonhomologous end-joining pathway. D) nucleotide excision repair pathway. E) synthesis-dependent strand annealing pathway.
Which of the following is an example of imprinting?
A. Thumb-sucking in humans B. Salmon always returning to the stream in which they were raised C. Ducks learning to quack D. Defending a territory
A diploid cell divides by a process called________ to produce haploid cells.
Fill in the blank(s) with the appropriate word(s).