Individuals with the disorder xeroderma pigmentosum are hypersensitive to sunlight. This occurs because their cells cannot_____
A) replicate DNA
B) undergo mitosis
C) exchange DNA with other cells
D) repair thymine dimers
D
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In the fungus pictured, which of the following structures is indicated by C?
A. mycelium B. hyphae C. fruiting body D. spores E. rhizoid
Blue flower color (B allele) is dominant to white (b allele). If a population of plants in Hardy-Weinberg equilibrium contains white flowers (bb) at a frequency of 0.04, what is the frequency of the heterozygous genotype?
A. 0.96 or 96% B. 0.2 or 20% C. 0.32 or 32% D. 0.64 or 64% E. 0.8 or 80%
Which hormone is associated with the biological clock?
a. insulin b. growth hormone c. melatonin d. cortisol e. prostaglandins
A plant breeder is attempting to breed a variety of corn with high oil content. Each generation, he crosses only those plants that have the highest oil content. Over time, the average oil content of his plants increases. He does this with two strains of plants. For Strain A, h2 = 0.3. For Strain B, h2 = 0.6. Which strain will more quickly increase in oil content with selection?
a. Strain A b. Strain B c. Strain C d. No difference