As a drosophila research geneticist, you keep stocks of flies of specific genotypes. you have a fly that has normal wings (dominant phenotype). flies with short wings are homozygous for a recessive allele of the wing-length gene. you need to know if this fly with normal wings is pure-breeding or heterozygous for the wing-length trait. what cross would you do to determine the genotype, and what results would you expect for each possible genotype?
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Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.
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As a drosophila research geneticist, you keep stocks of flies of specific genotypes. you have a fly...
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