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.

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

A diploid cell divides by a process called________ to produce haploid cells.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology