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 colors 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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The rate of killing by an antimicrobial agent may slow when the microbial population has been greatly reduced because the remaining population may have a high proportion of resistant organisms.
Answer the following statement true (T) or false (F)
The basic method of genetic analysis in humans requires a(n) ____________________ of several generations. What will be an ideal response?
Which of the following best describes semiconservative replication?
a. The translation of a DNA molecule into a complementary strand of RNA. b. A DNA molecule consists of one parental strand and one new strand. c. The number of DNA molecules is doubled with every other replication. d. The replication of DNA never takes place with 100% accuracy. e. The replication of DNA takes place at a defined period in the cell cycle.
Contraction of the fibers labeled A in Figure 40-2 results in:
a. elongation of the body.
b. elongation of the tentacles.
c. elongation of the gastrovascular cavity.
d. shortening of the body.
e. expansion of the pedal disk.