# Genetics

posted by .

Hi, I really need help in how to approach this question:

A species of tiny antelope, known as the zephyr, has an XY system of sex determination, similar to mammals. Zephyr males have small antlers and females do not. The antlers can be two pronged (2-pr) or three pronged (3-pr) and this is determined by a single gene which is found on the X chromosome (there is no allele for 2-3 pronged on the Y chromosome). In a large population, 74% of the adult males have two-pronged antlers and the rest of the adult males have three pronged antlers.

a) What is the frequency of the three pronged allele in the adult male population?

Is it 0.26??

b) Assuming that the allele frequency is the same in the females, what are the expected genotypic frequencies in the females.

Any help would be very much appreciated. Thanks.

• Genetics -

I think a) is 0.26.
b) if you take the 2-pr allele to be 'p' and the 3-pr allele to be 'q' then genotypic frequencies are p^2 for Xp2Xp2, 3^2 for Xp3Xp3 and 2(p)(q) for Xp2Xp3.
so Xp2Xp2 = 0.55
Xp3Xp3 = 0.07
Xp2Xp3 = 0.19

## Similar Questions

1. ### AP Biology

My F1 generation gave me 30 males (5 were mutated) and 10 females 5 were mutated. My F2 generation gave me 50 males, 20 were mutated, and 30 females, 15 were mutated. I donâ€™t know how to determine my crosses identifying if its sex …
2. ### Biology

How is sex (gender) determined in mammals?
3. ### biology

The sex ratio(number of females vs. males) of which of the following species might be most affected by global warming?
4. ### statistics

A certain geneticist is interested in the proportion of males and females in the population that have a certain minor blood disorder. In a random sample of 1500 males, 75 are found to have disorder, whereas 80 of 2000 females appear …
5. ### statistics

In an extensive study involving thousands of British children, Arden and Plomin (2006) found significantly higher variance in the intelligence scores for males than for females. Following are hypothetical data, similar to the results …
6. ### biology

In chickens, males have two Z sex chromosomes (ZZ) and females have one Z and one W sex chromosome (ZW). The mechanism for inheritance of the sex chromosomes is exactly the same as for X and Y sex chromosomes in other species. In chickens …
7. ### Statistics

The Education Testing Service conducted a study to investigate differences between the scores of males and females on the SAT. The study identified a random sample of 562 females and 852 males that had achieved the same high score …
8. ### biology

In chickens, males have two Z sex chromosomes (ZZ) and females have one Z and one W sex chromosome (ZW). The mechanism for inheritance of the sex chromosomes is exactly the same as for X and Y sex chromosomes in other species. In chickens …
9. ### Genetics

Why are emerging f2 progeny frome crosses one, two, and three should be counted and phenotyped over a period of seven days?
10. ### Life Span Development

1. In adolescence and early adulthood, males and females begin to spend more time in mixed-gender groups. Studies of who has more influence on the outcome of problem solving in mixed-gender groups indicate that: A. Females have an …

More Similar Questions