Question

In: Anatomy and Physiology

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

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?

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?

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?

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

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

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

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

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 10 months ago

Next > < Previous

Related Solutions

Red-green color blindness is due to an X-linked recessive allele in humans. A widow’s peak (a...

Red-green color blindness is due to an X-linked recessive allele in humans. A widow’s peak (a hairline that comes to a peak in the middle of the forehead) is due to an autosomal dominant allele. Consider the following family history: A man with a widow’s peak and normal color vision marries a color-blind woman with a straight hairline. The man’s father had a straight hairline, as did both of the woman’s parents. Use the family history to make predictions about...

Hemophilia is a sex linked recessive condition. A woman who is a carrier for hemophilia marries...

Hemophilia is a sex linked recessive condition. A woman who is a carrier for hemophilia marries a man who is not a carrier. a) What is the chance of their daughters having hemophilia? b) What is the chance of their daughters being carriers for the hemophilia allele?

A normal man marries an affected woman with an X-linked recessive disease. The expected genotypes of...

A normal man marries an affected woman with an X-linked recessive disease. The expected genotypes of their offspring are_________.

5. A man whose blood type is B, and whose mother was type O, marries a...

5. A man whose blood type is B, and whose mother was type O, marries a woman with type A, whose father was type O. What are the genotype for the man and his wife and the genotypes and phenotypes of any offspring? Show cross. Man’s Mother genotype: Woman’s father’s genotype: Man’s genotype: X Woman’s genotype: Offsprings phenotype ( blood type) 6. A man, whose blood type is A and whose mother had blood type O marries a woman whose...

A woman with “hitch-hiker’s thumb” marries a man who lacks this trait (but whose mother had...

A woman with “hitch-hiker’s thumb” marries a man who lacks this trait (but whose mother had it). What is the probability that a child born to this couple will have a hitch-hiker’s thumb?

4. An albino man marries a normally-pigmented woman who had an albino mother. Show the types...

4. An albino man marries a normally-pigmented woman who had an albino mother. Show the types of children that this couple may have and the proportions of each. (Albino is recessive; normal is dominant).

In humans, hypercholesterolemia is a dominant autosomal disorder. Color-blindness is a recessive disorder carried on the...

In humans, hypercholesterolemia is a dominant autosomal disorder. Color-blindness is a recessive disorder carried on the X-chromosome. A woman with normal vision who does not have hypercholesterolemia takes her daughter to a doctor for an examination. In the course of the examination, the doctor discovers that the girl is color-blind and has hypercholesterolemia. What does the doctor automatically know about the genotype and phenotype of the girl’s father?

A recessive allele on the X chromosome is responsible for red-green color blindness in humans. A...

A recessive allele on the X chromosome is responsible for red-green color blindness in humans. A woman with normal vision whose father is red-green color blind marries a male with normal vision. Which of the following best predicts the phenotypes of their children? A. All of the children will have normal vision. B. All of the daughters will have normal vision, and half of the sons will be red-green color blind. C. All of the daughters will have normal vision,...

4. In humans, red-green color blindness is recessive to normal sight. The gene for this trait is...

4. In humans, red-green color blindness is recessive to normal sight. The gene for this trait is carried on the X chromosome. In each of the following, give the genotype and phenotype of all possible offspring and their expected ratios. Give the phenotypic ratios of males ♂ and females ♀ separately (ALWAYS FOR X-LINKAGE): (a) a color-blind man married to a normal- sighted woman whose father is color-blind; (b) a man with normal color vision married to a color-blind woman.

Borishphobia is an autosomal recessive inherited condition in humans that causes AP Biology students to go...

Borishphobia is an autosomal recessive inherited condition in humans that causes AP Biology students to go into convulsions whenever they see the Hardy-Weinberg formula. Complete dominance is the mode of inheritance for the alleles in this condition. In a group of 300 AP Biology students, 97 had convulsions (because they had the condition) during their first Hardy-Weinberg Problem Set. (Assume that students are a representative sample of a population at Hardy-Weinberg equilibrium.) What is the frequency of the borishphobia (b)...

Subjects