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A. Susceptibility to poison ivy in humans is inherited as a simple recessive trait. Determine the genotypes of the parents and offspring for the following families. When two alternative genotypes are possible, list both.

a. Two normal parents have seven children, five normal and two susceptible.

b. A normal male and susceptible female have four children, all normal.

B. Which of Mendel’s postulates are demonstrated above? Explain your answer.

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Sixta Kovacek
Sixta KovacekLv2
28 Sep 2019

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Related questions

1.) This summer, there was a surge in the number of albino children killed for their body parts in the African country of Malawi (yes, it's bizarre but sadly true: http://goo.gl/8o0imm and http://goo.gl/DK0r8M). Albinism in humans is inherited as a simple recessive trait. Assuming that two non-albino (normal) parents have five children, four of which are normal and one of which is albino, which of the following statements is true? Select all that apply (you must select all correct answers to get credit). Assume that 'A' indicates the non-albino allele and 'a' indicates the albino allele.

Multiple answers:You can select more than one option

A)The 4 normal children are heterozygous Aa

B)At least one of the normal siblings must be homozygous AA

C)The frequency of albino children is as expected for Mendelian inheritance

D)One of the parents cannot be Aa

E)One third of the normal children expected to be AA while the others Aa

2.)

Albinism in humans is inherited as a simple recessive trait. Assuming that a normal male and an albino female have 6 children, all normal, which of the following statements is true? Select all that apply (you must select all correct answers to get credit).

Multiple answers:You can select more than one option

A)The father could be heterzygous for the trait

B)The probability that all the children are heterozygous for the trait is (1/2)^5 = 1/32

C)The father cannot be Aa

D)The children should all be heterozygous for the trait

E)One would expect about 2/3 of the normal children to be Aa

F)The father must be AA

3.)

Given an albino male mating with a normal female to produce 3 normal children and 3 albino children, which of the following of Mendel's postulates are not being demonstrated by this particular scenario? Select all that apply (to get credit, all your choices must be correct).

Multiple answers:You can select more than one option

A)Postulate of segregation

B)Postulate of dominance

C)Postulate of independent assortment

D)Postulate of unit factors

4.)

Consider the cross: Ee ff Gg HH x Ee Ff gg HH (assume these are designations for genes that are inherited in a Mendelian fashion). What is the probability that a single offspring from this cross would be genotypically: ee Ff Gg HH or Ee ff gg HH?

A)1/16

B)1/32

C)9/64

D)1/6

E)3/16

F)27/64

G)1/64

H)3/64

I)1/8

J)3/8

1. Short hair is due to a dominant gene (S) in rabbits and long hair is its recessive allele (s). A cross between a short-haired male and a long-haired male produced a litter of one long-haired and seven short-haired bunnies.

a) What ate the genotypes of the parents?

b) What phenotype ratio was expected on the offspring generation?

c) How many of the eight bunnies were expected to be long-haired?

2. The lack of pigmentation in humans called albinism is the result of a recessive gene and normal pigmentation if the result of its dominant allele. Two normal parents have an albino child. Determine the probability that the next child will be an albino.

Explain your answers.

1) A sex-linked recessive allele of gene B is the subject of this problem. Assume that a man with the recessive allele marries a woman with a normal phenotype. The woman's father had the recessive allele too. What is the probability that the couple will have a daughter with the recessive phenotype?

2)Albinism is inherited as a simple recessive trait. If a woman and her husband are both heterozygous for albinism then what is the probability that their first five children will have these phenotypes? Child 1 - albino; child 2 - normal; child 3 - normal; child 4 - albino; child 5 - normal?

3)Glucose-6-phosphate dehydrogenase deficiency (G6PD) is inherited as an X-linked recessive gene in humans. A woman whose father suffered from G6PD marries a normal man. (a) What proportion of their sons is expected to be G6PD? (b) If the husband were G6PD deficient would you change your answer in part (a)?

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