Describe how sperm and egg cells are different from somatic cells in number of chromosomes (in humans), the cell division processes they undergo and the process that generates them, and the process they undergo to generate a zygote
What will be an ideal response?
Sperm and egg cells have 23 chromosomes in humans; somatic cells have 46 chromosomes. Sperm and egg cells are the products of meiosis, but they do not undergo any cell division themselves. Instead, sperm and eggs fuse in fertilization to produce a zygote.
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Choose the true statements about species that show convergent evolution. Check all that apply.
_____ do not share a recent common ancestor _____ must be found in the same biogeographical region _____ subject to similar selection pressures _____ have similar phenotypes
The amino acid referred to as the "helix breaker" (because it lacks the hydrogen atom needed for hydrogen bonding) is
A) leucine. B) proline. C) methionine. D) valine. E) phenylalanine.
The intermediate-disturbance hypothesis predicts that the most species rich communities would contain
A. both r- and K-selected species. B. high rates of evapotranspiration. C. predominantly K-selected species. D. intermediate biomass. E. predominantly r-selected species.
What type of selection occurs when a lizard can be small enough to avoid being spotted by a predator or can be large enough to fend off predators?
A. Directional selection B. Stabilizing selection C. Disruptive selection D. Balancing selection