GENETIC Week10Lab - REVISED - 2nd ed (1).doc

The parents phenotype will be parent genotypes

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The parents phenotype will be: Parent Genotypes: Dihybrid Crosses Generation Genotype of Individual 1 Phenotype P YyGg Yello green P 1 YYGG Yello green P 2 yygg Blue red P 3 YYGG Yellow green P 4 YyGg Yellow green 2. How similar are they if you pool your data from each of the five replicates? The observed phenotype will be yellow green: blue red = 4:1 3. Is it closer or further from your prediction? It is similar to the predicted one as the yellow and green are dominant characters in respective traits, hence their ratio should be higher. 4. Did the results from the monohybrid or dihybrid cross most closely match your predicted ratio of phenotypes? The result of monohybrid cross matched well with the predicted one as it was easy to predict the result if the characters are only two (as in monohybrid) as compared to the four (as in dihybrid). 5. Based on these results, what would you expect for a cross involving 5, 10, or 20 independently sorted genes? If n equals the number of traits/genes:
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Number of F1 gamete types = 2 n Hence, for 5, 10, or 20 independently sorted genes, the number of F1 gametes will be 2 5 , 2 10 , and 2 20 , respectively. It means 32, 1024, and 1048576. Similarly, Proportion of F2 homozygous recessives = 1/(2 n ) 2 6. In cats, short hair (S) is dominant over long hair (s) and white coat (W) is dominant over non-white coat (w). Show a cross between an all-white cat with long hair and a non-white, short-haired cat. Both cats are homozygous for all traits. A. What would be the expected phenotypic ratio of the F1 offspring? The F1 offspring will be 100% white cat with short hair. B. What would be the expected phenotypic ratio of the F2 offspring? The phenotypic ratio of the F2 offspring will be: White cat with short hair : White cat with long hair : non-white cat with short hair : non- white cat with long hair = 9:3:3:1. *********************************************************************
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  • Summer '13
  • Pereira

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