# biology a-level aqa help

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#1
https://imgur.com/a/ibfaoi1
helpppp
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2 years ago
#2
First thing - you're more likely to get help if you explain what you've tried and where you've gone wrong.

The Hardy-Weinberg principle is pretty simple: Allele 1 frequency + Allele 2 frequency = 1
so: (A1 + A2)2 = 1
A1A1 + 2A1A2 + A2A2 = 1

A1A1 is the frequency of homozygous A1 individuals

2A1A2 is the frequency of heterozygous individuals

A2A2 is the frequency of homozygous A2 individuals

You know that in 2003, A1 (KDR minus) has a frequency of 20% (0.2), so A2 (KDR plus) is 0.8

Therefore the frequency of heterozygous individuals is 2*0.2*0.8 = 0.32

32% of the population is heterozygous.
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