Question

1.Certain characteristics, like coat color in many animals, is influenced by multiple genes. The phenomenon during which the presence of a homozygous recessive genotype at one locus "overrides" or masks the phenotype that would otherwise be produced by the alleles at another locus (regardless of whether they are dominant or recessive) is called:

pleiotropy

codominance

Punnett effect

recessive Epistasis

2. Which of the following would be considered a pleiotropic gene?

A gene that-along with several others-influences a single phenotype, such as blood pressure

A gene that, when two copies of a recessive allele are present, masks the phenotype determined by a gene at a different locus

A gene that has multiple alleles that behave codominantly

A gene involved in multiple phenotypes, like pigmentation, hearing and intestinal traits

3. A researcher believes that she had found the gene that determines weight in mice. However, when she removes this gene from all of the cells in an animal, she observes that there is no difference between its weight and that of untreated mice. Furthermore, she can observe no other atypical phenotypes in the subject mouse. How can this be explained?

Weight in mice is influenced by multiple alleles of the same gene.

Weight in mice is a polygenic trait.

Only the recessive allele of the gene determines an animal's weight.

The gene removed from the animal is pleiotropic.

4. Imagine you allowed a pea plant heterozygous for two genes-each determining independent traits-to self-fertilize. The plant has the genotype GgHh[JH1] , where: (1) G is a dominant allele and confers green pod color; (2) g is recessive and results in yellow pod color; (3) the H [JH2] allele results in plants with long stems; and (4) the h allele yields short stems. If you observed the following phenotypic ratios in the progeny, what can you deduce about the H and h alleles? 9 plants with green pods and long stems, 3 plants with green pods and short stems, 3 plants with yellow pods and long stems, 1 plant with yellow pods and a short stem[JH3]

h is dominant and H is recessive.

H is dominant, and h is recessive.

Both h and H are recessive alleles.

Both h and H are dominant alleles.

Answer 1

1. The answer is recessive Epistasis

2. The answer is A gene involved in multiple phenotypes, like pigmentation, hearing and intestinal traits

3. The answer is Weight in mice is a polygenic trait.

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