The genotypes of the normal females in the second generation in Figure 16-2 are:
a. homozygous for albinism.
b. heterozygous for hair color.
c. heterozygous for albinism.
d. X-linked.
e. unknown
C
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For a pure culture of Saccharomyces cerevisiae cells that were all derived from a single cell to mate,
A) a mating-type switch in one or more cells in the culture must occur. B) both the ? and the a gene must be fully expressed in the population. C) the ? gene must be fully repressed in the population. D) some cells must exist as diploids.
All prokaryotic photosynthesizers are anoxygenic.
Answer the following statement true (T) or false (F)
Nutrients are reintroduced into the upper reaches of the oceans from deeper areas by the process of:
a. wind and ocean currents. b. respiration of marine animals. c. excretion of wastes by animals. d. sinking of dead organisms. e. their attachment to floating plankton.
The chance of producing an offspring of genotype Aa Bb cc from a cross of Aa BB Cc with Aa BB Cc
is a. 1/32. b. 1/16. c. 3/32. d. 1/8. e. none (no chance of this offspring)