Question

the question is attached

Answer 1

As you probably know, women are usually born with XX chromosomes, while men are usually born with XY chromosomes.
The child genotype, X^bX^b, is given to us, and we are asked to infer the parent phenotype from this information. Either one or both or neither parent has the trait in question.

Can I ask: what does the superscript 'b' represent? Does that indicate the gene which causes the trait to be expressed? It does seem like some of the information relevant to the question is cut off in the screenshot.

Answer 2

Well, for now, I can use the information we have and lay out what we *definitely* know.
The child has the sex chromosomes X^bX^b. One of these X^b chromosomes came from the mother, and one of the X^b came from the father.
Since the father only has 1 X chromosome, we know that the father's X chromosome was definitely X^b.
By contrast, the mother has 2 X chromosomes, so we know that one of her X's was X^b, but we do not know what the mother's other X chromosome was for certain.

Answer 3

@smokeybrown

Answer 4

I guess, if "b" does represent the trait we're looking for, I'd say that the Father has the trait, since his only X chromosome must be X^b. Meanwhile, the Mother might just be a carrier, since her other X chromosome is unknown

Answer 5

Awesome! Thank you so much! So what should I put where?

Answer 6

@smokeybrown

Answer 7

is this correct?

Answer 8

Based on the options, I'd say "male with trait" in the right corner, and "female" in the left corner?

Answer 9

Awesome! Thank you so much! This was very helpful!

Answer 10

@smokeybrown

Answer 11

No problem! I hope it works out
(btw, you don't need to tag me; since I replied before, I get a notification whenever someone makes a new comment on this question)

Answer 12

Oh haha! Good to know! Thank you again!