Black hair color is dominant to white hair color in mice. Interpret the Punnett squrare below to determine the expected phenotypic ratio for the offpring of a homozygous black mouse and a white mouse. b. Bb Bb Bb Bb O A. 4 Black: 0 White O B. 3 Black: 1 White OC 2 Black: 2 White D D. O Black: 4 White B.
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- In roan bulls, alleles for both red and white hair are codominant (BRBW). What is the percentage of genotype and phenotype if a roan cattle is bred to, (a) a homozygous red cow (BRBR), (b) a heterozygous white cow (BWBw).Cross betweenAa and Aa individual fruitflies where A is normal and dominant over a which is mutant. This is simple mendelian trait A.name the phenotypes of the parents and write their genotypes B.determine the probabilities of the phenotype and genotype of Fi C.what are phenotypic ratios and genotypic ratios of F1A male dog with the genotype GgBb is crossed with a female dog with the genotype GgBb. Set up a punnet square Note: Gray hair (GG) is dominant over white hair (gg); Black eyes (BB) is dominant over red eyes (bb). (a) How many out of 16 have gray fur and black eyes? (b) How many out of 16 have gray fur and red eyes? (c) How many out of 16 have white fur and black eyes? (d) How many out of 16 have white fur and eyes red? Write the phenotypic ratio.
- A mouse from a true-breeding population with normal gait was crossed to a mouse displaying an oddgait called dancing. The F1 animals all showednormal gait.a. If dancing is caused by homozygosity for the recessive allele of a single gene, what proportion ofthe F2 mice should be dancers?b. If mice must be homozygous for recessive allelesof each of two different genes to have the dancing phenotype, what proportion of the F2 shouldbe dancers if the two genes are unlinked?(Assume that all the mice in the populationwith normal gait were homozygous fordominant alleles.)c. When the F2 mice were obtained, 42 normal and8 dancers were seen. Use the chi-square test todetermine if these results better fit the one-genemodel from part (a) or the two-gene model frompart (b).An Agouti with Himalayan gene female rabbit was mated by an albino male. The phenotypes for the filial generation are... a. Agouti and Himalaya b. Agouti, Himalaya and Albino c. Agouti and Albino d. Himalaya and AlbinoIf a male is homozygous dominant for a trait, that parent’s genotype might be DD. If the female is heterozygous for the same trait, her type would be Dd. a. How many genetically different sperm can the male produce? b. Using punnet square, determine the expected genotypic ratios of their offspring. c. What are the expected phenotypic ratios?
- 3. Codominance is when two dominant alleles of contrastingpair fully expressed at the same time in heterozygousindividual. Which of the following situation is an example ofcodominance?A. Jo mated the red bull with the white cow to produce a roan cow.B. Melissa traces her blood type by crossing the blood type of herparents.C. James passed a genetic disorder hypertrichosis pinnae aurisor hairy ear to his son.D. Tess crosses the red carnation flower plant with white flowercarnation plant to produce a pink flower plant.The heritability for egg weight in a group of chickens on a farm inMaine is 0.95. Are the following statements regarding this heritabilitytrue or false? If a statement is false, explain why.A. The environment in Maine has very little effect on the outcomeof this trait.B. Nearly all of the phenotypic variance for this trait in this groupof chickens is due to genetic variance.C. The trait is polygenic and likely to involve a large number ofgenes.D. Based on the observation of the heritability in the Mainechickens, it is reasonable to conclude that the heritability foregg weight in a group of chickens on a farm in Montana isalso very high.Answer this problem by listing the given genotypes, test crosses, and genotypic and phenotypic ratios. 1.)A couple whose genotype for eye color is Bb plans to have a child. What are the possible genotypes and phenotypes of the child in terms of eye color? Note that brown eyes (B) are dominant over blue eyes (b)
- a) Both parents in generation I have orange-brown fur. However in generation II, only one cub has orange-brown fur and the other two have white fur. Explain why this is so. b) Describe the possible genotype of tiger BCross a homozygous tall female carrier for hemophilia with a short normal male. Give genotypic and phenotypic ratios of the offspring. Use T = Tall, and t = short for one trait, and H =normal, and h = hemophilia for the second sex-linked trait. The Cross is: XHXhTT X XYtt . Question: What is the phenotypic ratio? a. 1:2:4:4 b. 4:4:4:4 c. 3:2:1:4 d. None is correctMendelian Genetics Consider blue eyes in a man as recessive to brown eyes. Show the expected children of a marriage between a blue-eyed woman and brown-eyed man who had a blue-eyed mother. Determine the genotypic ratio (GR) and phenotypic ratio (PR) of the F1 using Punnett Square Method. Hint: Determine the genotypes of each individual first.