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Related Flashcards
Cards In This Set
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A 1:2:1 phenotypic ratio in the F2 generation of a monohybrid cross is a sign of
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Incomplete dominance.
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In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will be short?
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0
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A plant with purple flowers is allowed to self-pollinate. Generation after generation, it produces purple flowers. This is an example of
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True-breeding
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A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers. This demonstrates
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Dominance
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What was the most significant result Gregor Mendel drew from his experiments with pea plants?
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Traits are inherited in discrete units, and are not the results of "blending."
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What is a genetic cross called between an individual of unknown genotype and a homozygous recessive?
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A testcross
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The fact that all seven of the garden pea traits studied by Mendel obeyed the principle of independent assortment means that the
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Seven pairs of alleles determining these traits behave as if they are on different chromosomes
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The probability that four coins will come up heads when flipped simultaneously is
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1/16 (0.063).
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A woman has six sons. The chance that her next child will be a daughter is
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1/2
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Two true-breeding stocks of garden peas are crossed. One parent had red, axial flowers and the other had white, terminal flowers; all F1 individuals had red, axial flowers. If 1,000 F2 offspring resulted from the cross, how many of them would you expect to have red, terminal flowers? (Assume independent assortment.)
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190
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In a dihybrid cross, the expected proportion of offspring showing both recessive traits is
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1/16
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In a cross between parents who both exhibit the dominant curly- and dark-haired traits, one child has straight, light-colored hair. What are the hair genotypes of the parents?
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CcDd and CcDd
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In a cross AaBbCc þ AaBbCc, what is the probability of producing the genotype AABBCC?
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1/64
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A 9:3:3:1 phenotypic ratio is characteristic of
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A dihybrid cross.
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Given the parents AABBCc þ AabbCc, assume simple dominance and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent?
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3/4
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