A breeder of cattle has a herd of white cows and a roan bull. Hair color in this breed is controlled by an
incompletely dominant gene. The two homozygous forms are either red or white, and the heterozygous
is roan.
(a) What color of calves are expected and in what proportions?
(b) Outline a procedure to develop an all-red herd. What will be an ideal response?
(a) 1/2 white, 1/2 roan
(b) Roan with white ? roan;
roan ? roan ? red;
roan ? red ? red;
red ? red ? red
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A continual source of genetic variation in populations is ________, which changes one allele into another.
A) mutation B) migration C) random mating D) natural selection
Which of the following statements incorrectly describes common structural features of an animal secretory cell and a photosynthetic plant cell?
a. Both cells have Golgi apparatus. d. Both cells have a plasma membrane. b. Both cells have mitochondria. e. Both cells have a nucleus. c. Both cells have chloroplasts.
Which of the following is a consequence of histamine release?
A) Decreased blood flow B) Constriction of the smooth muscle that surrounds arterioles C) Initiation of blood clotting D) Leaky capillary walls
The normal microbiota interact with potential pathogens in a variety of ways to protect the body, creating a situation known as microbial (antagonism/competition/resistance)
What will be an ideal response?