A gene on the X chromosome in chickens controls the rate of feather production. The allele for slow feather production, B, is dominant to the allele for rapid feather production, b. Crosses carried out by a farmer are shown in Figure 1 below. Figure 1 Key Male chickens are XX Female chickens are XY Male - rapid feather production Male - slow feather production Female - rapid feather production Female - slow feather 1 2 production 7 10 11 12 13 From the figure above provide one piece of evidence that shows that a recessive allele is responsible for rapid feather production. a) b) Provide all the likely genotypes of chicken 5 and chicken 7 in Figure 1 above. A cross between two chickens produced four offspring. This resulted in two of these being males with rapid feather production and two being females with slow feather production. Provide the possible genotypes of the parents. c)

A gene on the X chromosome in chickens controls the rate of feather production. The allele for slow feather production, B, is dominant to the allele for rapid feather production, b. Crosses carried out by a farmer are shown in Figure 1 below. Figure 1 Key Male chickens are XX Female chickens are XY Male - rapid feather production Male - slow feather production Female - rapid feather production Female - slow feather 1 2 production 7 10 11 12 13 From the figure above provide one piece of evidence that shows that a recessive allele is responsible for rapid feather production. a) b) Provide all the likely genotypes of chicken 5 and chicken 7 in Figure 1 above. A cross between two chickens produced four offspring. This resulted in two of these being males with rapid feather production and two being females with slow feather production. Provide the possible genotypes of the parents. c)

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter13: Patterns In Inherited Traits

Section: Chapter Questions

Problem 6GP: In sweet pea plant, an allele for purple flowers (P) is dominant when paired with a recessive allele...

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Red eyes is the wild-type phenotype in Drosophila, and severaldifferent genes (with each gene existing in two or more alleles) affect eye color. One allele causes purple eyes, and a different allelecauses vermilion eyes. The purple and vermilion alleles are recessive to red eye color. Two types of crosses provided thefollowing data:Cross 1: Males with vermilion eyes × females with purple eyes354 offspring, all with red eyesCross 2: Males with purple eyes × females with vermilion eyes212 male offspring with vermilion eyes221 female offspring with red eyesExplain the pattern of inheritance based on these results. Whatadditional crosses might you make to confirm your hypothesis?
In sweet pea plant, an allele for purple flowers (P) is dominant when paired with a recessive allele for red flowers (p). An allele for long pollen grains (L) is dominant when paired with a recessive allele for round pollen grain (l). Bateson and Punnett crossed a plant having purple flowers/long pollen grains with one having white/flowers/round pollen grains. All F1 offspring had purple flowers and long pollen grains. Among the F2 generation, the researchers observed the following phenotypes: 296 purple flowers/long pollen grains 19 purple flowers/round pollen grains 27 red flowers/long pollen grains 85 red flowers/round pollen grains What is the best explanation for these results?
A wild-type fruit fly (heterozygous for gray body color andred eyes) is mated with a black fruit fly with purple eyes. Theoffspring are wild-type, 721; black purple, 751; gray purple, 49;black red, 45. What is the recombination frequency betweenthese genes for body color and eye color? Using informationfrom problem 3, what fruit flies (genotypes and phenotypes)would you mate to determine the order of the body color, wingsize, and eye color genes on the chromosome?
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