# HELP one quick biology question!!!

Announcements Posted on
Take our survey to be in with the chance of winning a £50 Amazon voucher or one of 5 x £10 Amazon vouchers 28-05-2016
1. 1) In a population's gene pool, two alleles exist for a trait. C, the dominant allele, constitutes 60% of the gene pool. Homozygous dominant individuals constitute what percentage of the population?
A. 0.6% C. 36%
B. 52% D. 24%

2) What proportion of the gametes in this population contain gene c?
A. 0.16% C. 40%
B. 24% D. 48%

I know that number 1 is C- 36%, but I'm having alot of trouble trying to figure out number two! If someone could show me how to do it step by step, that would be amazing !!
2. (Original post by Keedeon)
1) In a population's gene pool, two alleles exist for a trait. C, the dominant allele, constitutes 60% of the gene pool. Homozygous dominant individuals constitute what percentage of the population?
A. 0.6% C. 36%
B. 52% D. 24%

2) What proportion of the gametes in this population contain gene c?
A. 0.16% C. 40%
B. 24% D. 48%

I know that number 1 is C- 36%, but I'm having alot of trouble trying to figure out number two! If someone could show me how to do it step by step, that would be amazing !!
You sure the potential answers to the second question are right? If gene C makes up 60% of the gene pool, surely the proportion of gametes with allele C would be >50%? I've tried to do the question a few times, and get an answer of 84% each time. Maybe answer D is a typo?
3. (Original post by Kidneyjean)
You sure the potential answers to the second question are right? If gene C makes up 60% of the gene pool, surely the proportion of gametes with allele C would be >50%? I've tried to do the question a few times, and get an answer of 84% each time. Maybe answer D is a typo?

I'm sure that the potential answers to the second question are right, yeah... :/
4. (Original post by Keedeon)
1) In a population's gene pool, two alleles exist for a trait. C, the dominant allele, constitutes 60% of the gene pool.

Homozygous dominant individuals constitute what percentage of the population?
A. 0.6% C. 36%
B. 52% D. 24%

2) What proportion of the gametes in this population contain gene c?
A. 0.16% C. 40%
B. 24% D. 48%

I know that number 1 is C- 36%, but I'm having alot of trouble trying to figure out number two! If someone could show me how to do it step by step, that would be amazing !!
Hi.

Unless I'm being stupid here, I'm pretty sure that the answer is C, 40%.

The recessive allele, c, is 40% of the population; because gametes have a random assortment of genes, the proportion of alleles in gametes is the same as proportion in the population.

Alternatively, you can say that the homozygous recessives make up 0.4x0.4=16% of the population, and the heterozygotes make up 0.4x0.6x2=48% of the population. All of the gametes produced by the homozygous recessives would contain the c gene, and half of the gametes produced by the heterozygotes would contain c.

Therefore, 16+(48/2)=40
5. Do you know how to solve for this question, I have no idea, I think the answer is 60%, but I'm not sure..

Sixty-four percent of a population is able to taste a chemical called PTC. Tasters are either homozygous dominant or heterozygous for the trait.

1. Calculate the percentage of the population that carries the recessive allele

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: June 8, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### Don't be a half-term hermit

How to revise this week and still have a life