Question

In: Anatomy and Physiology

In humans, a widow’s peak is recessive.  A purebred mother with no widow’s peak marries and a...

  1. In humans, a widow’s peak is recessive.  A purebred mother with no widow’s peak marries and a father with a widow’s peak.  What are the probable genotypes and phenotypes of their offspring?

  1. Assume in an animal that brown is dominant over white. The mother is heterozygous brown and the father is homozygous white. What are the probable genotypes and phenotypes of their offspring?

  1. Albinism is a condition in which pigmentation is lacking. In humans, the result is white hair, nonpigmented skin, and pink eyes. The trait in humans is caused by a recessive allele. Two normal parents have an albino child. What are the parents’ genotypes? What is the probability that the next child will be albino?

  1. Huntington disease is a rare fatal, degenerative neurological disease in which individuals start to show symptoms in their 40s. It is caused by a dominant allele. Joe, a man in his 20s, just learned that his father has Huntington disease.

a. what is the probability that Joe will also develop the disease?

b. Joe and his new wife have been eager to start a family. What is the probability that their first child will eventually develop the disease?

Solutions

Expert Solution

case 1

widow peak is recessive allele

mother prebred with no widow peak WW

father with widow peak ww

father allele left to right

mother allele down

 w w
W Ww Ww
W Ww Ww

phenotypic ratio ; ALL non widow peak

genotypic ratio all hybrid

case 2 mother is Bb hetrogygous brown

father is bb homozygous white

father left to right

mother down

 b b
B Bb Bb
b bb bb

phenotypic ratio : 2 brown : 2 white

genotypic ratio - 2 hybrid : 2 pure recessive breed

case 3 albinism recessive allele

Two normal parents have an albino child. What are the parents’ genotypes? What is the probability that the next child will be albino

parents must be hybrid

Aa Aa

child is aa

father left to right

mother down

 A a
A AA Aa
a Aa aa

phenotyic ratio of children for these parents 3 normal :1 albinic

genotypic ratio = 1:2:1

next child to be albino probability - 25%

case 4 joe father have huntington disease Hh

mother is hh no disease

a huntington disease is autosomal dominant disease

father left to right

mother down

 H h
h Hh hh
h Hh hh

probabiilty of joe to be suffered is 50%

b if joe is suffered from huntigton disease then probability in children is 50%

Sydney Mullin answered 1 year ago
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