7. How many different gametes are formed by an organism with the genotype AaBbCc

Question

7. How many different gametes are formed by an organism with the genotype AaBbCcDdEeFf with all genes exhibiting independent assortment?

8. How many different genotypes are produced by a cross between two organisms with the above genotype?

9. How many different phenotypes are produced by a cross between two organisms with the above genotype?

10. A tall pea plant with yellow seeds is heterozygous for both genes. If the plant is crossed with dwarf pea plant with green seeds (a testcross), what would be the phenotypic ratio for plant height/seed color for the progeny?

11. A tall pea plant with yellow seeds is self-fertilized and produces 1000 progeny plants as follows: 530 tall/yellow, 200 tall/green, 200 dwarf/yellow and 70 dwarf/green.

If you assume that the original plant is heterozygous for both alleles, what is the chi-square value?

12. Estimate the p value?

13. Does the p value reject or fail to reject the null hypothesis?

14. A pea plant heterozygous for seed shape is self-fertilized. What is the probability that two of four progeny plants will have smooth seeds?

Explanation / Answer

7. An organims with 6 traits ans two alleles each produce 26 = 64 different gametes are produced

8. There are 64 X 7 = 448 genotypes possible at the minimum

9. There are 64 different phenotypes possible in this cross

10. The test cross gives 4 genotypes, with phenotypes of 25% tall yellow plants, 25% tall green plants , 25% dwarf yellow plants, and 25% dwarf green plants

11. The Chi square for this observation is test is 2.238

12. P value is 0.5248

13. The P value failed to reject the null hypothesis, as the value is greater than the significant value

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