Which of the following is true of monocots?
a. have two cotyledons
b. leaf veins usually netlike
c. pollen grains with three pores
d. vascular bundles distributed throughout stem
ground tissue
e. floral parts in multiples of fours and fives
Answer: d
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The BRCA2 protein functions in double-strand break repair. If a woman is heterozygous for a loss-of-function allele of BRCA2, she
A) will develop cancer because two functional copies of BRCA2 are needed in every cell. B) will not get cancer because BRCA1 can compensate for the loss of BRCA2. C) will develop cancer after several mutations occur, even if the mutations occur in different clonal populations of cells. D) may develop cancer because mutation of the wild-type BRCA2 allele could destroy an important DNA repair mechanism.
Achondroplasia is a form of dwarfism caused by a dominant allele. The homozygous dominant genotype causes death, so individuals who have this condition are all heterozygotes. If a person with achondroplasia mates with a person who does not have achondroplasia, what percentage of their children would be expected to have achondroplasia?
A. 75% B. 0% C. 50% D. 100%
What would likely be true when P = 0.9?
A) Rate of extinction would be high. B) Rate of colonization would be high. C) Proportion of patch occupied would be low. D) Corridor size would be small.
Based on the species-area plot in the figure above, if habitable area on an island were reduced from 10,000 km2 (square kilometers) to 1000 km2, roughly what percentage of the species would disappear?
A) 0.3 percent B) 3 percent C) 30 percent D) 60 percent