For the fish model organism Medaka (Aplocheilus latipes), genes at 2 loci (B, b and R, r) determine color of the fish. Fish that have the dominant allele at both loci (B_ R_) are brown, fish with a dominant allele at the B locus (B_ rr) are blue, fish with a dominant allele at the R locus only (bb R_) are red, and fish that are homozygous recessive at both loci (bb rr) are white. What is the expected phenotypic ratio of offspring of cross between a homozygous brown and homozygous white Medaka fish? What is the expected phenotypic ratio of offspring if you then generate an F2 generations from the progeny above? Assume that you performed the cross and you observed 465 brown fish, 142 blue fish, 165 red fish, and 61 white fish in the F2 generation. Use a chi-square test to compare the observed and expected numbers of offspring. What conclusions can you draw from your statistical analysis of these results?

For the fish model organism Medaka (Aplocheilus latipes), genes at 2 loci (B, b and R, r) determine color of the fish. Fish that have the dominant allele at both loci (B_ R_) are brown, fish with a dominant allele at the B locus (B_ rr) are blue, fish with a dominant allele at the R locus only (bb R_) are red, and fish that are homozygous recessive at both loci (bb rr) are white. What is the expected phenotypic ratio of offspring of cross between a homozygous brown and homozygous white Medaka fish? What is the expected phenotypic ratio of offspring if you then generate an F2 generations from the progeny above? Assume that you performed the cross and you observed 465 brown fish, 142 blue fish, 165 red fish, and 61 white fish in the F2 generation. Use a chi-square test to compare the observed and expected numbers of offspring. What conclusions can you draw from your statistical analysis of these results?

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter19: Population Genetics And Human Evolution

Section: Chapter Questions

Problem 9QP: Using the HardyWeinberg Law in Human Genetics Suppose you are monitoring the allelic and genotypic...

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Tatuo Aida investigated the genetic basis of color variation in the medaka (Aplocheilus latipes), a small fish found in Japan (T. Aida. 1921. Genetics 6:554–573). Aida found that genes at two loci (B, b and R, r) determine the color of the fish: fish with a dominant allele at both loci (B_ R_) are brown, fish with a dominant allele at the B locus only(B_ rr) are blue, fish with a dominant allele at the R locus only (bb R_) are red, and fish with recessive alleles at both loci (bb rr) are white. Aida crossed a homozygous brown fish with a homozygous white fish. He then backcrossed the F1 with the homozygous white parent and obtained 228 brown fish, 230 blue fish, 237 red fish, and 222 white fish. Q.What results would you expect for a cross between a homozygous red fish and a white fish?
Tatuo Aida investigated the genetic basis of color variation in the medaka (Aplocheilus latipes), a small fish found in Japan (T. Aida. 1921. Genetics 6:554–573). Aida found that genes at two loci (B, b and R, r) determine the color of the fish: fish with a dominant allele at both loci (B_ R_) are brown, fish with a dominant allele at the B locus only(B_ rr) are blue, fish with a dominant allele at the R locus only (bb R_) are red, and fish with recessive alleles at both loci (bb rr) are white. Aida crossed a homozygous brown fish with a homozygous white fish. He then backcrossed the F1 with the homozygous white parent and obtained 228 brown fish, 230 blue fish, 237 red fish, and 222 white fish. Q.What results would you expect if you crossed a homozygous red fish with a homozygous blue fish and then backcrossed the F1 with a homozygous red parental fish?
Tatuo Aida investigated the genetic basis of color variation in the medaka (Aplocheilus latipes), a small fish found in Japan (T. Aida. 1921. Genetics 6:554–573). Aida found that genes at two loci (B, b and R, r) determine the color of the fish: fish with a dominant allele at both loci (B_ R_) are brown, fish with a dominant allele at the B locus only(B_ rr) are blue, fish with a dominant allele at the R locus only (bb R_) are red, and fish with recessive alleles at both loci (bb rr) are white. Aida crossed a homozygous brown fish with a homozygous white fish. He then backcrossed the F1 with the homozygous white parent and obtained 228 brown fish, 230 blue fish, 237 red fish, and 222 white fish. Q. Give the genotypes of the backcross progeny
Tatuo Aida investigated the genetic basis of color variation in the medaka (Aplocheilus latipes), a small fish found in Japan (T. Aida. 1921. Genetics 6:554–573). Aida found that genes at two loci (B, b and R, r) determine the color of the fish: fish with a dominant allele at both loci (B_ R_) are brown, fish with a dominant allele at the B locus only(B_ rr) are blue, fish with a dominant allele at the R locus only (bb R_) are red, and fish with recessive alleles at both loci (bb rr) are white. Aida crossed a homozygous brown fish with a homozygous white fish. He then backcrossed the F1 with the homozygous white parent and obtained 228 brown fish, 230 blue fish, 237 red fish, and 222 white fish. Q. Use a chi-square test to compare the observed numbers of backcross progeny with the number expected. What conclusion can you make from your chi-square results?
Using the HardyWeinberg Law in Human Genetics Suppose you are monitoring the allelic and genotypic frequencies of the MN blood group locus (see Question 2 for a description of the MN blood group) in a small human population. You find that for 1-year-old children, the genotypic frequencies are MM = 0.25, MN = 0.5, and NN = 0.25, whereas the genotypic frequencies for adults are MM = 0.3, MN = 0.4, and NN = 0.3. a. Compute the M and N allele frequencies for 1-year-olds and adults. b. Are the allele frequencies in equilibrium in this population? c. Are the genotypic frequencies in equilibrium?
Let’s suppose that pigmentation in a species of insect is controlled by a single gene existing in two alleles, D for dark and d for light. The heterozygote Dd is intermediate in color. In a heterogeneous environment, the allele frequencies are D = 0.7 and d = 0.3. This polymorphism is maintained because the environment has some dimly lit forested areas and some sunny fields. During a hurricane, a group of 1000 insects is blown to a completely sunny area. In this environment, the fitness values are DD = 0.3, Dd = 0.7, and dd = 1.0. Calculate the allele frequencies in the next generation.
Suppose that in a mammalian species, the allele for black hair (B) is dominant to the allele for brown hair (b), and the allele for curly hair (C) is dominant to the allele for straight hair (c). When an organism of unknown genotype is crossed against one with straight, brown hair, the phenotypic ratio is as follows: 25% curly black hair 25% straight black hair 25% curly brown hair 25% straight brown hair What is the genotype of the unknown parent? A. BbCC B. bbCc C. Bbcc D. BbCc
In a randomly mating laboratory population of Drosophila, 4 percent of the flies have black bodies (encodedby the autosomal recessive b), and 96 percent havebrown bodies (the wild type, encoded by B). If this population is assumed to be in Hardy–Weinberg equilibrium, what are the allele frequencies of B and b and thegenotypic frequencies of B/B and B/b?
You discover a new X-linked mutation for antenna shape in Drosophila (fruit flies) which produces long antennae. You call this new allele long (XL2), and discover it is incompletely dominant with the short antennae allele (XL1), meaning that heterozygotes have antennae that are intermediate in length. In your laboratory population, 9% of the males have long antennae. Assuming your population is in Hardy-Weinberg equilibrium, what proportion of females would you expect to have intermediate antennae? Answer choices: 0.50 0.90 0.83 0.0081 0.16
Within a mouse population, the black fur allele (B) is dominant to the white fur allele (b) and the short whisker allele (S) is dominant to the long-whisker allele (s). A heterozygous black-furred short-whiskered mouse is crossed with a homozygous white-furred long-whiskered mouse. What percentage of the offspring will be black-furred with long whiskers?
In a species of fish, the allele for long fins (F) is dominant over the allele for short fins (f). What will be the genotype and phenotype ratios for offspring do we get if we cross a long-finned homozygous male fish with heterozygous long-finned female fish? Questions: a. What are the possible genotypes of the egg the woman can produce? b. What are the possible genotypes of the sperm the man can produce? c. What is the genotype ratio for the offspring? d. What is the phenotype ratio for the offspring?
While studying the genetics of the "Cute Faced Bat" face structure gene, three alleles ) are identified that produce 6 genotypes and 4 phenotypes “Cute”, “Super Cute Nose”, “Super Cute Face”, and “Super, Duper Cute” (equally expressing both Super Cute Face and Super Cute Nose). Given these observations, what can you conclude about the allele interactions?