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Genetic Crosses, PLEASE HELP!

Genetics as it applies to evolution, molecular biology, and medical aspects.

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Genetic Crosses, PLEASE HELP!

Postby MonkeyNacho » Sun Aug 17, 2008 2:04 am

i have a question that i've now been trying to think of for a couple of hours, but my text book only explains half of what i need.

For this, (Corn kernels), the phenotypes and genotypes are: Su = Starchy, su = sugary, R = Purple, r = yellow

The question is: A cross between two pure breeding (Homozygous) corn plants was set up to produce an F1 generation. Complete:

PARENTS: Phenotype - ........ X .........
Genotpye - .........X ..........

what i don't understnd, however, is if i use two Hoomozygous dominant parents, or recessive, or 1 of each? because it sayd two pure breeding ones, but i don't know if that means 2 of the same, or different pure bred corn plants...any suggestions?
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Postby MisterATP » Sun Aug 17, 2008 4:13 pm

Pure-breeding is when a two or more plants with a very similar phenotype, that when breed together create offspring that are very similar or identical to the parents.
So I think you will get the same offspring only when both parens are homozygous dominat or recessive.
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Postby mith » Sun Aug 17, 2008 7:46 pm

They probably mean two different plants, otherwise the results wouldn't be very interesting.
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