During meiosis II in sperm development
A) primary spermatocytes divide meiotically to form diploid secondary spermatocytes.
B) secondary spermatocytes divide meiotically to form haploid spermatids.
C) spermatids divide meiotically to form haploid spermatozoa.
D) sperm and oocyte meet and merge.
B) secondary spermatocytes divide meiotically to form haploid spermatids.
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The nitrogenous base that is in RNA but not in DNA is
A) thymine. B) thiamine. C) uracil. D) urea.
Since many altruistic individuals do not reproduce, how are the genes for their behavior passed on? a. All altruistic individuals are born infertile; their sacrifices do not impair their reproductive potential
b. Altruists generally sacrifice themselves for close relatives, thus they share some genes with the individuals they help protect. c. Altruism always develops among highly inbred populations, where each individual is a near identical genetic copy of every other individual. d. Genetic evidence suggests that altruistic behavior results from mutant genes.
A population's age structure tracks
a. the average age of the members of the population. b. how long the population has existed in the area. c. the rate at which the population is aging. d. the relative numbers of each age.
As a group, fungi are _____.
a) photoautotrophs b) decomposers c) herbivores d) carnivores e) chemoautotrophs