BIOL 1201 Lecture Notes - Lecture 8: Zygosity, Mendelian Inheritance, Haemophilia

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indigognat287

13 Nov 2016

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Mastering biology 8: a man has six fingers on each hand and six toes on each foot. His wife and their daughter have the normal number of digits. Remember that extra digits is a dominant trait. Express your answer using the slash symbol and no spaces (for example, 1/16): a black guinea pig crossed with an albino guinea pig produces 12 black offspring. When the albino is crossed with a second black one, 7 blacks and 5 albinos are obtained. Both parents are homozygous for brown eyes (bb), but one is a blond (rr) and the other is a redhead (rr). What is the probability that their next child will be a brown-eyed redhead: a man with hemophilia (a recessive, sex-linked condition) has a daughter of normal phenotype. She marries a man who is normal for the trait. A color-blind man marries a woman with normal vision whose father was color- blind.

Related Questions

a black pig is crossed with an albino pig and produces 12 black offspring. the albino pig is crossed again with a second black pig and produces 7 black and 5 albino. what are the genotypes for the parents, gametes, and offspring?

amberbadger529

2. A black guinea pig crossed with an albino guinea pig produced 12black offspring. When the albino was crossed with a second blackone, 7 blacks and 5 albinos were obtained. What is the bestexplanation for this genetic situation? Write genotypes for theparents, gametes, and offspring.

3. The litter resulting from the mating of two short-tailed catscontains three kittens without tails, two with long tails, and sixwith short tails. What would be the simplest way of explaining theinheritance of tail length in these cats? Show the genotypes.

4. A normal vision man and woman produce three boys, one of whichis colorblind and the other two with normal vision. What are thegenotypes of the parents? (This is a sex-linked problem)

For each problem I need to know the following plus whateverspecifics the problem requests:

Key: (Which symbol stands for which allele) â Use the sameletter for a gene using a capital to designate dominant and lowercase to show recessive.

Parental genotypes

Possible gametes for each parent

The Punnett Square

1. In guinea pigs black coat color is dominant to brown coatcolor. A black guinea pig (from a long line of black guinea pigs)is bred to a brown guinea. If one of these offspring is then bredto a different brown guinea pig, what are the expected genotypesand phenotypes of their offspring?

2. In pea plants tall stems are dominant to short stems andpurple flowers are dominant to white flowers. A true breeding plantwith tall stems and white flowers is crossed with a true breedingplant having short stems and purple flowers. The offspring fromthis cross are grown up and allowed to interbreed. What are theexpected genotypes and phenotypes of their offspring?

3. In dogs, black is dominant to golden. You have a blackLabrador retriever you would like to stand at stud, but first youwant to know if it is homozygous black or heterozygous. You make atestcross to determine this. What are the expected genotypes andphenotypes if your dog is heterozygous? If it is homozygous?

4. Color-blindness is X-linked in humans. A color-blind manmarries a woman whose father was color-blind. What are the expectedgenotypes and phenotypes of their children?

pucemole610

BIOL 1201 Lecture Notes - Lecture 8: Zygosity, Mendelian Inheritance, Haemophilia

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