heterozygous X homozygous recessive

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maraldy
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heterozygous X homozygous recessive

Post by maraldy » Sun Jan 08, 2006 8:14 pm

I have a monohybrid cross
heterozygous X homozygous recessive
Aa X aa
A=purple
a=white
I know it gives me a 1:1 ratio
how can i know the color???
how can i know what is dominant in a 1:1 ratio??

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Post by bearhug » Sun Jan 08, 2006 8:38 pm

Aa x aa gives you 2 heterozygous and 2 homozygous recessive. 2:2 = 1:1. You can't know the actual phenotypes unless you actually see the results. This problem just gives the possible outcomes of breeding Aa with aa. You know A is dominant over a, so if you were to actually see the results of breeding these flowers and ended up with a Purple flower than you know that it must have a genotype Aa or if it is white than aa. However, incomplete dominance or codominance could be also be possible. Hope this helps.
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MrMistery
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Post by MrMistery » Mon Jan 09, 2006 6:58 pm

I take it that the students in the US have reached mendel's laws? :) :) :)
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CoolJay221
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Post by CoolJay221 » Mon Jan 09, 2006 7:02 pm

Peple these days have to use their brains instead of asking others to do their work
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PM me to find out my personal!

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Post by sdekivit » Mon Jan 09, 2006 8:45 pm

MrMistery wrote:I take it that the students in the US have reached mendel's laws? :) :) :)


it's punnet square period :roll: :D :lol:

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MrMistery
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Post by MrMistery » Tue Jan 10, 2006 7:23 pm

This is nothing. Just wait for cellular respiration period. We are flooded with questions, or at least we used to be
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

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