You are Here: Home >< A-levels

# Hardy- Weinberg Question Help!

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016
1. Colour is controlled by a single gene with twoalleles. The allele for black, B, is dominant to the allele for red, b.

Some of the results from the investigation are shown in the table.

Year Season Frequency of b allele
1933 Autumn 0.70
1934 Spring 0.82
1934 Autumn 0.59
1935 Spring 0.76
1935 Autumn 0.57
1936 Spring 0.78

(b) Use the Hardy-Weinberg expression to estimate the percentages of red ladybirds and black lady birds in the Autumn 1933 ladybird population.

Mark scheme:
Two marks for correct answer of 49% red and 51% black;
One mark for incorrect answer in which p/frequency of black allele/B is
Identified as 0.3 and q/frequency of black allele/B as 0.7;

Ive got up to finding 0.3=p and 0.7=q but am stuck with what to do after
2. (Original post by Lollypop0)
Some of the results from the investigation are shown in the table.

Year Season Frequency of b allele
1933 Autumn 0.70
1934 Spring 0.82
1934 Autumn 0.59
1935 Spring 0.76
1935 Autumn 0.57
1936 Spring 0.78

(b) Use the Hardy-Weinberg expression to estimate the percentages of red ladybirds and black lady birds in the Autumn 1933 ladybird population.

Mark scheme:
Two marks for correct answer of 49% red and 51% black;
One mark for incorrect answer in which p/frequency of black allele/B is
Identified as 0.3 and q/frequency of black allele/B as 0.7;

Ive got up to finding 0.3=p and 0.7=q but am stuck with what to do after
You have not posted the full info to use Hardy-Weinburg e.g. the allele for red and also black ladybird (e.g. whether its homozygous recessive or not)
3. Hopefully added all info required now

## 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: May 22, 2016
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

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll

## All the essentials

### Student life: what to expect

What it's really like going to uni

### Essay expert

Learn to write like a pro with our ultimate essay guide.

### Create a study plan

Get your head around what you need to do and when with the study planner tool.

### Resources by subject

Everything from mind maps to class notes.

### Study tips from A* students

Students who got top grades in their A-levels share their secrets