In people with sickle-cell disease the red blood cells break down, clump, and clog the blood vessels. The bloo?

In people with sickle-cell disease the red blood cells break down, clump, and clog the blood vessels. The blood vessels and the broken cells accumulate in the spleen. Among other things this leads to physical weakness, heart failure, pain, and brain damage. Such a suite of symptoms can be explained by _____. (9.14)

A) the polygenic nature of sickle-cell disease

B) the pleiotropic effects of the sickle-cell allele

C) the disease being the result of the inheritance of two linked genes

D) a bacterial infection interacting with the sickle-cell allele

E) side effects of the drugs used to cure sickle-cell disease

Flower color in snapdragons is an example of incomplete dominance. If a red-flowered plant is crossed with a white-flowered plant, the F1 generation has pink flowers. If a pink-flowered plant is crossed with a pink-flowered plant, the progeny plants will be __________. (9.12)

A) 100% pink

B) 100% red

C) 25% red, 50% pink, and 25% white

D) 50% pink and 50% red

E) 25% white and 75% red

The inheritance of height and weight can best be described as _____. (9.15)

A) simple dominant-recessive inheritance

B) being caused by microorganisms

C) polygenic

D) all symptoms of Huntington's disease

E) the results of a bad lifestyle