How can I determine whether a trait is sex-linked or not?
i am given phenotypes of the P generation, the F1 and F2.
for example, 3 males with yellow eyes X 3 females with normal eyes
42 males with yellow eyes
29 females with yellow eyes
10 females with normal eyes
30 males with normal eyes
that's just an example. how do i determine wether the yellow eyes are a sex-linked triat?
- Anonymous1 decade agoFavorite Answer
Sex linked simply means carried on the X chromosome.
Typically, most examples of sex linked genes are recessive, and show up MORE commonly in males, since they only have 1 X chromosome.
However, the reverse applies also- if a sex linked gene were dominant, you would see it MORE commonly in females, since they have 2 chances to get it.
That said- look at your proportions- 50% of the pups have yellow eyes, total. Looking by sex, yellow eyes is present roughly 55-45 in males.
However, it is 75-25 in females.
I would suspect that this gene could be sex linked dominant.
That said, you have way too small of a population to say anything definitive.Source(s): I pretty much know everything about biology- check ou my other answers.
- bickingLv 44 years ago
Y appropriate recessive features will in common words take position in some male and no ladies. Y appropriate dominats will be in all adult males and no ladies. X appropriate dominates will be in all offspring. X appropriate recessives will be in some ladies yet no adult males. that's only Mendelian ratios and there are a selection of exceptions. Genetic make up does no longer continually finally end up in a particular phenotype. Many different elements in touch.
- Anonymous1 decade ago
i don't know how to prove it but 10 females with normal eyes, that looks a bit low compared to the other phenotypes
- 1 decade ago
I'm pretty sure sex-linked traits can only be carried by males since they are XY. So if you have any females with the problem then it probably isn't sex-linked.