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How do I use these Genotypes and Phenotypes in a Dihybrid Cross?

smileetons

wrote...

Posts: 21

Rep:

12 years ago

How do I use these Genotypes and Phenotypes in a Dihybrid Cross?

I need to use Rrtt and rrTt, but doesn't the Rrtt only give you three? I'm confused, please HELP!

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2 Replies

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Replies

toku

wrote...

#1

12 years ago

Make a 4 by 4 square. Write RT, rT, Rt and rt on the top and left. Croos them and you will get 16 phenotypes and genotypes. The dominant is always R and T. This is tobe noted. \

For the image check: http://library.thinkquest.org/12022/l8c.gif

toku

wrote...

#2

12 years ago

Not sure what you're looking for, but this is a 2x2 Punnett square. Rrtt produces 2 kinds of gametes, Rt and rt. rrTt produces 2 kinds of gametes, rT and rt. The Punnett square is:
______Rt______rt___
rT____RrTt____rrTt__
rt____Rrtt_____rrtt__

Both the genotypic and phenotypic ratios are 1:1:1:1

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