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Title: How do I use these Genotypes and Phenotypes in a Dihybrid Cross? Post by: smileetons on Apr 14, 2012 I need to use Rrtt and rrTt, but doesn't the Rrtt only give you three? I'm confused, please HELP!
Title: How do I use these Genotypes and Phenotypes in a Dihybrid Cross? Post by: toku on Apr 14, 2012 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 Title: How do I use these Genotypes and Phenotypes in a Dihybrid Cross? Post by: toku on Apr 14, 2012 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 |