Tay-Sachs disease (TSD) is an inborn error of metabolism thatresults in death, often by the age of 2. You are a geneticcounselor interviewing a phenotypically normal couple who tell youthat the male had a female first cousin (on his father

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Related questions

1. If you had a fruitfly with phenotype A, what test would you make to determine if it was Aa or AA? Explain the different outcomes expected if the fly in question is AA or Aa.

2.The sex of birds, some insects, and other organisms is determined by a ZW chromosomal arrangement in which the males have like sex chromosomes (ZZ) and females are ZW (similar to XY in humans). Assume that a recessive lethal allele on the Z chromosome causes death of an embryo in birds. What sex ratio would result in the offspring if a cross were made between a male heterozygous for the lethal allele and a normal female?

3.A recessive gene for red-green color blindness is located on the X chromosome in humans. Assume that a woman with normal vision (her father is color-blind) marries a color-blind male. What is the likelihood that this couple's first son will be color-blind?

4. One form of hemophilia is caused by a sex-linked recessive gene. Assume that a man with hemophilia marries a phenotypically normal woman whose father had hemophilia. What is the probability that they will have a daughter with hemophilia? (Note: In this problem, you must include the probability of having a daughter in your computation of the final probability.)

5. One form of hemophilia is caused by a sex-linked recessive gene. Assume that a man with hemophilia marries a phenotypically normal woman whose father had hemophilia. What is the probability that their first son will have hemophilia?

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GENETICS PROBLEMS

PLEASE help me with these questions! I've provided the answers I just need to see the WORK, detailed work so I can understand. Thank you sooo much.

21. In some genetically engineered corn plants the dominant gene (BT) produces a protein that is lethal to certain flying insect pests that eat the corn plants. It was also found that the pollen could cause death in some flying insects. If the corn plant is heterozygous for BT, what proportion of the pollen would carry the dominant gene?

Answer: 1/2

25. Sickle cell anemia is a recessive trait in humans. In a cross between a father who has sickle cell anemia and a mother who is heterozygous for the gene, what is the probability that their first three children will have the normal phenotype?

Answer: 1/8

26. The dominant trait, Huntington disease causes severe neural/brain damage at approximately age 40. A female whose mother has Huntington disease marries a male whose parents are normal. It is not known if the female has the disease. What is the probability that their firstborn will inherit the gene that causes Huntington disease?

Answer: 25%

***Just need the answer for #10 - 8 & 9 included for more info***

8- A Martian creature called a gazook has 17 pairs of chromosomes. Three genes for three traits are considered: eyeball gene with two alleles, round and square (R, r); tail gene with two alleles, hairy and smooth (H, h); and toe gene with two alleles, 9 toes and 11 toes (T, t). Round eyeballs, hairy tails and 9 toes are dominant to square eyeballs, smooth tail and 11 toes. A male has offspring with a gorgeous female who has square eyeballs, a hairy tail and 9 toes on each of her three feet! She gives birth to 200 little gazooks, who have the following phenotypes: - 100 have round eyeballs, 100 have square eyeballs - 100 have hairy tails, and 100 have smooth tails - 150 have 9 toes, and 50 have 11 toes What is the chance that in the future, this couple will have an offspring who is not phenotypically identical to either of the parents? Hint: Calculate the chance for the offspring to be phenotypically identical to either of the parents, then subtract it from 100%. A- 12.5% B- 25% C- 50% D- 62.5% E- 75% F- 87.5%

9- In the question above, what is the chance that this couple (couple A) will have a child, who is a boy, genotypically identical to one of the parents (mom or dad), and a child, who is a girl phenotypically identical to one of the parents (mom or dad)?

A- 3/16 chance for the girl, and 1/8 chance for the boy

B- 1/4 chance for both

C- 1/2 chance for the girl, and Â½ chance for the boy

D- 1/8 chance for the girl, and 3/16 chance for the boy

E- 1/8 chance for the girl, and 3/8 chance for the boy

F- 1/16 chance for both

10- In the scenario above, another couple (couple B) and their 200 little gazooks move in the next door house. All the little gazooks are phenotypically identical to their father. The female is a supermodel who has square eyeballs, a smooth tail, and 11 toes on each of her three feet, and the male has round eyeballs, a hairy tail, and 9 toes. One year later, both Mrs. A and Mrs. B get pregnant, and each one gives rise to 200 new gazooks in the following year. The new children of couple A, all have round eyeballs, hairy tails, and 9 toes. Some of the new children of couple B have square eyeballs, smooth tails and 11 toes. What is the genotype of Mr. B, and which of the following is true?

A- Mr. B is âRrHHTTâ, and he did not have an affair with Mrs. A

B- Mr. B is âRRHHTTâ, and he had an affair with Mrs. A.

C- Mr. B is âRRHHTTâ, and Mr. A had an affair with Mrs. B.

D- Mr. B is âRRHHTtâ, and he had an affair with Mrs. A.

E- Mr. B is âRRHHTtâ, and both Mrs. A and Mrs. B have some explaining to do because of the night they spent in a bar when both Mr. A and Mr. B had gone to a bachelor party together.

F- B and C are correct

G- D and E are correct