6) A long winged male crow with a head ruff mates with a short winged crow witho

Question

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)

Key:

Long winged male crow = L

Head ruff = R

Short winged female crow = l

No head ruff = r

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

is this the correct way to do this

Are either of these genes sexed linked

What is your reasoning

ZLr

ZLR

Zlr

ZLrZlr

ZLRZlr

W

ZLrW

ZLRW

Explanation / Answer

you can think of both the traits seperately....

first, the size of the wing can be clearly seen as the long being dominant over the recessive short as all the offsprings are long wings irrespective of the gender. So here the genotypeof the parents should be LL (Male) x ll (Female).

Now about the head ruff, since male parent has a head ruff while female parent doesnt, and both male and female projeny have 50% chance of having a headruff, I would sat that the genotype of the parent should be Hh (Male) x hh(Female) giving 50% Hh (Headruff) and 50% hh (No headruff) as seen in the question. This would mean that the headruff trait is also not sex linked neither the size of the wing and havind a head ruff is considered dominant.

If it was sex linked, X linked for example, the results would never be 50% chance for both female as well as males.

Feel free to leave a comment down below for any further query. Good rating would be appretiated if you find my answer helpful. Thank you.

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