Height (tallness) in humans is a polygenic trait. Assume the following: There are 4 genes that determine height (Aa, Bb, Cc, Dd). Each dominant allele adds 2 inches of height to an individual. The height of the recessive individual (aa, bb, cc, dd) is 5 feet. What is the height of a person with the genotype (AA, Bb, cc, DD)?
A. 5 feet, 4 inches
B. 5 feet, 10 inches
C. 5 feet, 8 inches
D. 6 feet, 6 inches
E. 5 feet, 6 inches
B. 5 feet, 10 inches
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Fibroblast cells are a good model system for studying muscle differentiation because
A. they are totipotent. B. they never differentiate into muscle cells in a normally developing animal. C. they can differentiate into muscle cells in a normally developing animal. D. they express a limited number of genes. E. they have a small genome.
If your mother is heterozygous for Huntington’s disease, which is caused by a dominant allele, the odds that you will
inherit the disorder from her are ____.
a. 1/4 b. 1/2 c. 3/4 d. 1 e. 0
Warm-up exercise
A. increases blood flow to muscles. B. raises the temperature of muscles. C. increases heart rate. D. All of the above are correct.
The process of substances moving from the filtrate inside a kidney tubule into the peritubular capillaries is called ________________________.
A. glomerular filtration B. tubular reabsorption C. tubular secretion D. antidiuresis E. aldosterone processing