Question 4 production) is recessive. Using the letters \'A\' and \'a to represen

Question

Question 4 production) is recessive. Using the letters 'A' and 'a to represent thé 2t8 following. Show your work! You may use Punnett squares or probabilities 8 ulls B, m a. What is the probability of a child having albinism when one parent has albinism and the other does not? Be sure to state both the expected genotype and phenotype ratios. (Apts) b. What is the probability of a child having albinism if both parents are heterozygotes? Be sure to state both the genotype and phenotype ratios. (3pts) 3. Andalusian chickens have either white, blue, or black plumage. Plumage color is inherited via incomplete dominance. Given this information show with a Punnett square the probability of a blue chicken offspring resulting from a cross of a white hen and black cock. Indicate what letters you will use to represent the 2 alleles (one for black and one for white). Be sure to state both the phenotypic and genotypic ratios. Show your work! You may use Punnett squares or probabilities. (4pts) 4. Now, consider what would happen if Andalusian chicken feather color was inherited via codominance. Cross a white hen with a black cock. What are the resulting phenotypic and genotypic ratios? What is the appearance of the heterozygote? Be sure to state both the phenotypic and genotypic ratios. Show your work! You may use Punnett squares or probabilities. (4pts) 5. A woman with type A blood just had her first child. The child had type A blood. What are possible genotypes of the father? Write all of them out. Use P possible cross. Be careful to indicate male and female (10pts) Punnett squares to show your work for every 6. Cystic fibrosis is a recessive disease. What is the probability that a daughter will have cystic fibrosis i her parents is homozygous dominant and the other is a carrier for cystic fibrosis? Show your work.(4 ex-inked gene on the Y chromosome causes a rare disease. A woman married to a man with the has three children. The first two are daughters without the disease. The third is a son. What is the pro that he will have the gene? Show your work. (4pts)

Explanation / Answer

Codominance: Both the alleles are expressed in the heterozygote
WW = White
BB = Black
Parental cross: WW X BB
F1 progeny: WB
In F1, all progeny show mixed color pattern i.e. Black and white
F1 selfing: BW X BW
F2 progeny: BB BW BW WW
Phenotypic ratio = 1 (Black) : 2 (Black and white) : 1 (White
Genotypic ratio = 1(BB) : 2 (BW) : 1 (WW)

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