1. If you want to determine if phenotype counts in your experiment deviate from

Question

1. If you want to determine if phenotype counts in your experiment deviate from predicted counts,which test would you use?

2. In ball pythons, coral glow coloration is recessive to wildtype coloration and is Z-linked. If a wildtype female is crossed to a coral glow male, what proportion of female progeny will have the coral glow phenotype?

3. Flower color in blue-eyed Marys (Collinsia parviflora) is controlled by two genes. At the B locus, blue flowers (B) is dominant to magenta (b). At the W locus, colored flowers (W) is dominant to colorless (w). Plants with the genotype B-W- are blue, bbW- are magenta, and --ww are colorless. A true-breeding plant with magenta flowers is crossed with a true-breeding plant with white flowers, producing F1offspring with blue flowers. What is the expected phenotypic ratio for F2 progeny after selfing the F1?

4. Two linked genes, (G) and (H), are separated by 20 cM. A man with genotype Gh/gH has children with a woman who is gh/gh. What is the probability that their first child will be Gh/gh?

Explanation / Answer

1. If you want to determine if phenotype counts in your experiment deviate from predicted counts, the test you would use would be chi square test.

2. Z- linked traits are always expressed in females due to the presence of only one Z chromosome. So when wildtype female is crossed to a coral glow male, the proportion of female progeny that will have the coral glow phenotype will be 100%.

3. After selfing the expected phenotypic ratio of F2 progeny will be 9:3:4.

4. A man with genotype Gh/gH has children with a woman who is gh/gh.The probability that their first child will be Gh/gh is 0.5

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