In guinea pigs, black coat color, B, is dominant to albino, b. Rough coat, R, is dominant to smooth coat, r. Two animals are selected for breeding. Their genotypes are BBRR and bbrr. Specify the expected genotypic and phenotypic ratio in the following crosses. a. In the F1 generation b. In the F2 generation c. Among the offspring produced from crossing one of the F1 pigs having the genotype BBRr.

In guinea pigs, black coat color, B, is dominant to albino, b. Rough coat, R, is dominant to smooth coat, r. Two animals are selected for breeding. Their genotypes are BBRR and bbrr. Specify the expected genotypic and phenotypic ratio in the following crosses. a. In the F1 generation b. In the F2 generation c. Among the offspring produced from crossing one of the F1 pigs having the genotype BBRr.

Name: In guinea pigs, black coat color, B, is dominant to albino, b. Rough c
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Description: In guinea pigs, black coat color, B, is dominant to albino, b. Rough coat, R, is dominant to smooth coat, r. Two animals are selected for breeding. Their genotypes are BBRR and bbrr. Specify the expected genotypic and phenotypic ratio in the followin

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter11: The Basic Principles Of Heredity

Section: Chapter Questions

Problem 10TYU: A walnut comb rooster is mated to three hens. Hen A, which has a walnut comb, has offspring in the...

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A dark-red strain and a white strain of wheat are crossed and produce an intermediate, medium-red F1. When the F1 plants are interbred, an F2 generation is produced in a ratio of 1 dark-red: 4 medium-darkred: 6 medium-red: 4 light-red: 1 white. Further crosses reveal that the dark-red and white F2 plants are true breeding. (a) Based on the ratios in the F2 population, how many genes are involved in the production of color? (b) How many additive alleles are needed to produce each possible phenotype? (c) Assign symbols to these alleles, and list possible genotypes that give rise to the medium-red and light-red phenotypes. (d) Predict the outcome of the F1 and F2 generations in a cross between a true-breeding medium-red plant and a white plant
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Tomato Plants In tomato plants, round fruit (R) is dominant to oval fruit (r). Pure breeding plants with red and round fruit (FFRR) were crossed to pure breeding plants with yellow and oval fruit (ffrr). The red and round F1 progeny were then testcrossed to plants that were homozygous recessive for both genes (ffrr) with the following results: Phenotypes Number of Offspring Red and round 2 255 Red and oval 290 Yellow and round 310 Yellow and oval 2 145 Part A: Record the phenotypes and the phenotype ratio in lowest terms. Part B: Convert the expected phenotypic ratio from Part A into the expected probability for each of the four phenotypes and record them in the table below. Calculate the probability for each of the four phenotypes observed in the cross from the data presented at the beginning of the question by dividing the number of progeny in each class by the total number of progeny and record these in the table below. (Probability = Number of Progeny in Phenotype…
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Hibiscus plants have different varieties of flowers. In an instance, both the red and white flowers showed that they are incompletely dominant with each other. If the flowers that were produced in the Hibiscus experiment was cross bred with each other, what is the ratio of their genotype? Explain. A) 1:3 B) 1:1:1:1 C) 1:2:1 D) 2:2
In guinea pigs, short hair (S) is dominant to long (s). Black fur (B) is dominant to albino (b). A female from a strain which is pure breeding for black fur and short hair is mated to a male from a strain pure breeding for the albino condition and long hair. (A). What will be the phenotypes of the F1? (B) If members of the F1 are mated among themselves, what percentage of offspring can be expected to be homozygous for both traits? Give the genotypes and phenotypes of these homozygotes.
In a study of black guinea pigs and white guinea pigs, 100 black animals were crossed with 100 white animals, and each cross was carried to an F2 generation. In 94 of the crosses, all the F1 offspring were black and an F2 ratio of 3 black:1 white was obtained. In the other 6 cases, half of the F1 animals were black and the other half were white. Why? Predict the results of crossing the black and white F1 guinea pigs from the 6 exceptional cases.
The correct answer is : codominance and incomplete penetrance because in codominance, heterozygotes express both alleles equally, so heterozygotes will have two phenotypes, both visible. In incomplete penetrance, some individuals with a particular genotype have a phenotype that does not match their genotype. The ratio shown suggests that not all heterozygotes have the splotchy phenotype normally expected and instead have the dominant brown phenotype.