Genetics From Genes to Genomes Study Set 1

Biology

Quiz 3 :
Extensions to Mendels Laws

Quiz 3 :
Extensions to Mendels Laws

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Two alleles of gene C control hair color in horses: C¹ and C².Horses homozygous for allele C¹ are red, heterozygotes are yellow, and C² homozygotes are cream.What type of allele interaction is described?
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Answer:

C

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If a phenotype is controlled by the genotypes at two different loci, a possible interaction between alleles of these genes can be called
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Answer:

A

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A pure-breeding fruit fly with curled wings mates with a pure-breeding fruit fly with normal (straight)wings.The F1 mate with each other to produce an F2 generation that consists of 160 flies with curled wings and 80 with straight wings.What can you infer from this observation?
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Answer:

B

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What can explain the phenomenon where the same genotype might give rise to different phenotypes?
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Two alleles of gene C control hair color in horses: C¹ and C².Horses homozygous for allele C¹ are red, heterozygotes are yellow, and C² homozygotes are cream.In the offspring of matings between heterozygotes, what phenotypic ratio is expected?
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If a trait is controlled by two codominant alleles of one gene, what phenotypic ratio is expected in the offspring of a mating of two heterozygotes?
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Which genotypic ratio indicates a recessive lethal allele when two heterozygotes are mated?
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ABO blood type demonstrates which of the following inheritance patterns? (Select all that apply. )
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A particular flower can be purple, blue, red, or white.A pure-breeding red plant is crossed with a pure-breeding white one, and the F1 are then crossed to produce an F2 generation.Which of the following phenotypic ratios in the F2 indicate that flower color in these plants is controlled by two genes?
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If a gene for a trait is monomorphic in a population and two random individuals mate, what would be the most likely phenotypic ratio for that trait in the offspring?
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What genetic phenomenon might a 2:1 phenotypic ratio indicate?
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A particular flower can be purple, blue, red, or white.Two different pure-breeding white plants are crossed and the F1 are then crossed to produce an F2 generation.What might a 9:7 phenotypic ratio in the F2 indicate?
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A particular flower can be purple, blue, red, or white.A pure-breeding purple plant is crossed with a pure-breeding white plant and the F1 are then crossed to produce an F2 generation.What might a 9:3:4 phenotype ratio in the F2 indicate?
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Which ratio would indicate that a phenotype is controlled by multiple genes?
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Predict the genotypes and phenotypes of the F1 progeny of a cross between a pure-breeding black rat and an albino that is also homozygous for cream.
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Predict the phenotypic ratio of the F2 progeny of a parental cross between a pure-breeding black rat and an albino that is also homozygous for cream.
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Predict the genotypes and phenotypes of the F1 progeny of a cross between two white-flowered plants, one homozygous for A and the other homozygous for B.
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Predict the phenotypic ratio of the F2 progeny of a cross between two white-flowered plants, one homozygous for A and the other homozygous for B.
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The inheritance pattern of daisy flower color provides an example of what type of gene interaction?
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A disease is caused by homozygosity for the g allele (G is the corresponding wild-type allele).However, the penetrance of the disease is 75%.Two individuals known to be heterozygotes have a child.What is the probability that the child exhibits the disease?
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