Why does sexual reproduction result in more genetic variation in a species?
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a. it increases the chromosome number.
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b. it mixes the chromosomes of the two parents.
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c. it produces haploid organisms.
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d. it increases the number of genes in each organism.

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.

What are the pros and cons of transect sampling?

Which level of taxonomy has the fewest organisms?