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A parent of a CAH daughter is having a difficult time understanding why their daughter continuously prefers to play with male-typical toys rather than female typical toys. How would you use your understanding of sexual development of the brain and biology to explain this behavior to this parent?

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Nestor Rutherford
Nestor RutherfordLv2
28 Sep 2019

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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.

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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?

6) A long winged male crow with a head ruff mates with a short winged crow without a head ruff. All of their male offspring have long wings, half of them have a head ruff and half lack a head ruff. All of the female offspring have long wings and half have a head ruff and half do not. A) Are either of these genes sex-linked? B) What is your reasoning? C) What is the most likely genotype for each parent and type of offspring? (4 pts)

What would be a key for this problem

Long winged male crow

Head ruff

Short winged female crow

No head ruff

Is this the correct way to do this and Are either of these genes sexed linked

What is your reasoning

Genotype for parents

Long winged male crow with a head ruff = ZLrZLR

Short winged female crow without a head ruff = ZlrW

Genotype for offsprings

½ Male offspring have long wings and a head ruff = ZLRZlr

½ Male offspring have long wings without a head ruff = ZLrZlr

½ Female offspring have long wings and a head ruff = ZLRW

½ Female offspring have long wings without a head ruff = ZLrW

ZLr

ZLR

Zlr

ZLrZlr

ZLRZlr

W

ZLrW

ZLRW

Are either of these genes sexed linked

What is your reasoning

Ask this question several times still do not understand how do you know is? Is there a way to explain it in everyday words.

10) Hunchback serves as a silencer protein for the gene encoding Ultrabithorax. A) Which of these two genes is epistatic to the other? B) How do you know? received several scientific answers that I do not understand.

Epistasis is a form of gene interaction in which one pair of genes masks or hides the phenotypic expression of another. Hunchback (hb) gene is epistatic to Ultrabithorax (Ubx) gene.

Thank you very much. I would appreciate it if you can answer both. Do not have many questions remaining to ask for the month.

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