11. In a dihybrid cross, we consider two traits at the same time. Suppose in a species of fish, long tail (T) is dominant over short tail (t) and blue body color (B) is dominant over green body color (b) and the genes for these two traits lie on two different chromosomes. Suppose we want to predict the offspring that would result from crossing a father who is heterozygous to both traits and a mother who is homozygous recessive for both traits. Genotype of the father: Genotype of the mother: Phenotype of the father; Phenotype of the mother:

11. In a dihybrid cross, we consider two traits at the same time. Suppose in a species of fish, long tail (T) is dominant over short tail (t) and blue body color (B) is dominant over green body color (b) and the genes for these two traits lie on two different chromosomes. Suppose we want to predict the offspring that would result from crossing a father who is heterozygous to both traits and a mother who is homozygous recessive for both traits. Genotype of the father: Genotype of the mother: Phenotype of the father; Phenotype of the mother:

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Description: 11. In a dihybrid cross, we consider two traits at the same time. Suppose in a species of fish, longtail (T) is dominant over short tail (t) and blue body color (B) is dominant over green bodycolor (b) and the genes for these two traits lie on two d

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter13: Genes, Chromosomes, And Human Genetics

Section: Chapter Questions

Problem 5TYK

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In cats, the genotype AA produces tabby fur color; Aa is also a tabby, and aa is black. Another gene at a different locus is epistatic to the gene for fur color. When present in its dominant W form (WW or Ww), this gene blocks the formation of fur color and all the offspring are white; ww individuals develop normal fur color. What fur colors, and in what proportions, would you expect from the cross AaWw Aa Ww?
Imagine you are performing a cross involving seed color in garden pea plants. What Fi offspring would you expect if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over green. 100 percent yellow-green seeds 100 percent yellow seeds 50 percent yellow, 50 percent green seeds 25 percent green, 75 percent yellow seeds
The dominant C allele of a gene that controls color in corn produces kernels with color; plants homozygous for a recessive c allele of this gene have colorless or white kernels. What kinds of gametes, and in what proportions, would be produced by the plants in the following crosses? What seed color, and in what proportions, would be expected in the offspring of the crosses? a. CCCc b. Cccc c. CcCc
Another gene in Drosophila determines wing length. The dominant wild-type allele of this gene produces long wings; a recessive allele produces vestigial (short) wings. A female that is true- breeding for red eyes and long wings is mated with a male that has purple eyes and vestigial wings. F1 females are then crossed with purple-eyed, vestigial-winged males. From this second cross, a total of 600 offspring are obtained with the following combinations of traits: 252 with red eyes and long wings 276 with purple eyes and vestigial wings 42 with red eyes and vestigial wings 30 with purple eyes and long wings Are the genes linked, unlinked, or sex-linked? If they are linked, how many map units separate them on the chromosome?
Design an Experiment Imagine that you are a breeder of Labrador retriever dogs. Labs can be black, chocolate brown, or yellow. Suppose that a yellow Lab is donated to you and you need to know its genotype. You have a range of dogs with known genotypes. What cross would you make to determine the genotype of the donated dog? Explain how the resulting puppies show you the Labs genotype.
1. A male fruit fly, heterozygous for both vestigial wings and ebony body, is crossed with a female homozygous for normal wings and heterozygous for ebony body. What fraction of their offspring will have normal wings and an ebony body?
4. In dogs , curly hair is dominant to straight hair , and spotted coats are dominant to solid coats . If one dog has straight hair and is heterozygous for spotted coat is crossed with a dog that is heterozygous for both curly and spotted coat , determine the probability that the two dogs will have a puppy with curly hair and solid coat ?
1. In rabbits, mono-colored fur (F) and straight ears (E) are dominant over spotted-fur and floppy ears. Your son owns a rabbit possessing white fur and floppy ears, and he mated it with another rabbit. The offspring of the rabbits turn out to be 8 in total. 4 are possessing white fur with straight ears, while the remaining 4 has spotted white and brown fur with straight ears. a. What are the traits (phenotype) present on the other rabbit mated to your son’s rabbit? Create a table to properly note the phenotypes and genotypes. Considering that your son continued breeding his rabbit to the original rabbit, what will be the probability that it will produce: b. male white fur with straight eared rabbit c. 2 male white fur with floppy eared rabbit d. 2 male white furred, straight eared rabbits and 4 female spotted white and brown, straight eared rabbits
1. In guinea pigs, black hair (B) is dominant to brown hair (b) and short hair (H) is dominant to long hair (h). A heterozygous black, long-haired guinea pig is crossed with a brown, heterozygous short-haired guinea pig. What percentage of the offspring will be black with long hair?
1. Most of the individuals of a certain wildflower population have white flowers, although a few are purple-flowered. Crosses have demonstrated that allele for white color flower (W) is dominant over the allele for purple (w). a. Give the genotype of a purple-flowered plant, and show the gametes that it would produce as a result of meiosis. b. If two heterozygous whoite-flowered plants are crossed. What fraction of the offspring do you expect to be purple? c. If two purple-flowered plants are crossed, what fraction of their offspring do you expect to be white? 2. In one study, Gregor Mendel crossed yellow-seeded, tall garden pea with a green-seeded, short garden pea. The F1 offspring were all yellow-seeded and tall. Assuming independent assortment of these two genes, what phenotypes and proportions did he fin among F2 offspring when the F1 garden peas are allowed to fertilize themselves? 3. Thorn apples produce either purple (P) or white (p) flowers, and their fruits are either…
8. In guinea pigs, the allele for black fur (B) is dominant over the allele for white fur (b). Similarly, the allele for straight hair (H) is dominant over the allele for having rough hair (h). Pure breeding rough haired guinea pigs with black fur were crossed with pure breeding straight haired guinea pigs with white fur. a. State the genotype and the phenotype of the F1 individuals produced as a result of this cross.b. Two F1 offspring were mated together. Calculate the expected ratio of phenotypes in the F2 generation.c. Show the completed Punnett square below.
4. An albino corn snake is crossed with a normal-coloredcorn snake. The offspring are all normal-colored.When these first-generation progeny snakes arecrossed among themselves, they produce 32 normalcolored snakes and 10 albino snakes.a. How do you know that only a single gene is responsible for the color differences between these snakes? b. Which of these phenotypes is controlled by thedominant allele?c. A normal-colored female snake is involved in atestcross. This cross produces 10 normal-coloredand 11 albino offspring. What are the genotypes ofthe parents and the offspring?