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Hardy Weinberg question - a level biology help??
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A population of summer plants produced only green and yellow plants. The percentage of plants producing yellow fruit in this population was 36%.
Use Hardy-Weinberg equation to calculate number of plants that were heterozygous for gene B
I've tried but I can't do it
can anyone help?
The one alleles that code for yellow are aaBB, aaBb & aabb
The answer is 32%
Use Hardy-Weinberg equation to calculate number of plants that were heterozygous for gene B
I've tried but I can't do it
can anyone help?The one alleles that code for yellow are aaBB, aaBb & aabb
The answer is 32%
Last edited by lollypenguin; 1 year ago
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#2
P^2 2pq q^2 = 1 P^2 = 0.64 so P = 0.8 q =0.2 so 2pq = 2× (0.2 × 0.8) = 0.32then ×100 as it is a percentage to get 32%
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#3
(Original post by SBB887)
P^2 2pq q^2 = 1 P^2 = 0.64 so P = 0.8 q =0.2 so 2pq = 2× (0.2 × 0.8) = 0.32then ×100 as it is a percentage to get 32%
P^2 2pq q^2 = 1 P^2 = 0.64 so P = 0.8 q =0.2 so 2pq = 2× (0.2 × 0.8) = 0.32then ×100 as it is a percentage to get 32%
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#4
(Original post by Maryyam Moazzam)
how do you know that P squared is 0.64
how do you know that P squared is 0.64
I think this is the paper it's from - part of question 7. In that it seems to be clear that to be yellow phenotype the squashes need a B allele. The green ones are bb.
(And they're all aa – any with an A allele would be white.)
So if 36% are yellow (or 0.36 out of 1) then 64% (or 0.64 out of 1) must have the bb genotype.
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#5
p^2 2pq q^2=1
Where p^2 2pq=0.36, because yellow flowers are caused by either the BB (p) allele combo or Bb (2pq) combo. bb is q.
So, 1-0.36=0.64 (q^2).
Use the equation p q=1 to find p, then subtract q and p squared from 1 to find 2pq
(ps where there are spaces there should be pluses, TSR randomly removed them)
Where p^2 2pq=0.36, because yellow flowers are caused by either the BB (p) allele combo or Bb (2pq) combo. bb is q.
So, 1-0.36=0.64 (q^2).
Use the equation p q=1 to find p, then subtract q and p squared from 1 to find 2pq
(ps where there are spaces there should be pluses, TSR randomly removed them)
Last edited by ZombieTheWolf; 1 year ago
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