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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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juliaroberts juliaroberts
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12 years ago
I knowit can be done with two diffrent alleles, for example SSRr*SsRr. But how do you do it with three traits or more like Rr Ss and another trait standing for let's say Tt. Our teacher absolutley refuses to teach us this and he says to look it up on our own! Help,because i can't find anything on it and i have a test on it! Thanks!
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12 years ago
You have to determine the number and type of gametes.  The number of different gametes is found by the formula 2?(number of heterozygous genes), so SSRrTt produces 4 kinds of alleles, since there are 2 heterozygous genes (the R and the T).  Similarly, SsRrTt has three heterozygous genes, so it produces 2?3 or 8 types of gametes.  The types of gametes includes all the possible combination of the alleles, remembering that each gamete must have only one allele from each gene.

SSRrTT x SsRrTt ? 4x8 Punnett square.
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