The problem that occurred during meiosis in sperm formation was
A) nondisjunction involving a Y chromosome.
B) an inversion of the X chromosome, preventing the pairing of sex chromosomes.
C) failure of the second meiotic division to take place.
D) formation of diploid sperm.
Answer: A
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In a population in Hardy-Weinberg equilibrium, 75 percent of the individuals have a dominant allele for a particular gene (p=0.75) and 25 percent have a recessive allele (q=0.25). The proportion of homozygous recessive individuals in the F1 generation will be
A) 2.5%. B) 6.25%. C) 18.75%. D) 0%.
A sterile mule is produced by mating a horse and a donkey. This is an example of reproductive isolation.
A. prezygotic B. allopatric C. postzygotic D. sympatric E. parapatric
When population growth rate = rN, this type of growth can be called
A. growth at the carrying capacity. B. exponential growth. C. logistic growth. D. sigmoid growth.
The centromere of a chromosome separates during ________
A) prometaphase B) anaphase C) interphase D) prophase E) telophase