Genetics From Genes to Genomes Study Set 1

Biology

Quiz 2 :

Mendels Principles of Heredity

Quiz 2 :

Mendels Principles of Heredity

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img What does the pattern of inheritance in this pedigree indicate about the disease allele?
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According to Mendel's Law of Independent Assortment,
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Which of the following probabilities is correct regarding a mating of an Ss RR individual to an individual who is Ss Rr ? (A - indicates the the second allele is either dominant or recessive. )
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In some genetically engineered corn plants, a Bt gene was added to a chromosome.The Bt gene specifies a protein called Bt that is lethal to certain flying insect pests that eat the corn plants.If the corn plant is is heterozygous for the Bt gene (one homolog has the introduced Bt gene and the other does not), what proportion of the sperm would carry the Bt gene? Is the presence of the Bt gene (a mutation)dominant or recessive to its absence (the wild type)?
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Why did Mendel perform reciprocal crosses?
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Sickle cell anemia is a recessive trait in humans.In a cross between a father who has sickle cell anemia and a mother who is heterozygous for the sickle cell allele, what is the probability that all of their first three children will be unaffected?
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In a monohybrid cross AA × aa, what proportion of homozygotes is expected among the F2 offspring?
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Among the dihybrid crosses below, which will produce a 1:1 phenotypic ratio?
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Assume that in guinea pigs, dark brown fur (B)is dominant to black fur (b).If you mate a black guinea pig with a homozygous brown guinea pig, what proportion of the progeny will be homozygous?
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In the testcross Aa Bb × aa bb, what proportion of individuals are expected to be homozygous for both genes in the F1 generation?
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In a dihybrid cross AA bb × aa BB, what proportion of the F2 offspring is expected to be homozygous for at least one gene?
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If an individual has 10 gene pairs, how many different gametes can be formed if three of the gene pairs are homozygous and the remaining seven gene pairs are heterozygous?
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An Ss × Ss mating is performed.If the phenotypic ratio of the progeny is 3 S- (- indicates that the other allele is unknown)to 1 ss, then
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The reason that the HD allele acts as a dominant allele is that
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The mutations found in the CF gene that result in cystic fibrosis are recessive because
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Suppose that in plants, smooth seeds (S)is dominant to wrinkled seeds (s), and tall plants (T)is dominant to short plants (t).An F1 plant from a mating between homozygous plants that were tall/smooth and short/wrinkled was crossed to the short/wrinkled parent.What proportion of the progeny is homozygous for short and wrinkled alleles?
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What is the outcome of crossing two pure-breeding plants with antagonistic traits?
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Assume that in guinea pigs, dark brown fur (B)is dominant to black fur (b).If you mate a homozygous black guinea pig with a heterozygous brown guinea pig, what proportion of the progeny will be black?
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An allele that expresses its phenotype even when heterozygous with a recessive allele is termed
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What is the difference between cross- and self-fertilization?
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