Question

for each croos, write the hypothesies being tested, and provide expected phenotypic ratios (using simply mutant/wild type) that will represent the hypothesis in your chi-square tests.

monohybrid cross:

dihybrid cross:

complementation:

x-linkage:

Answer 1

For monohybrid cross:

Null hypothesis: The observed values are not deviating from the Mendilian monohybrid cross F2 ratio i.e. 3:1.

The expected values or ratio is 3:1

For dihybrid cross:

Null hypothesis: The observed values are not deviating from the Mendilian dihybrid cross F2 ratio i.e. 9:3:3:1.

The expected values or ratio is 9:3:3:1.

For complementation:

Null hypothesis: The observed values are not deviating from the dihybrid complementation ratio i.e. 9:7.

The expected values or ratio is 9:7.

For X Linkage: (Female is phenotypically normal and male is x linked diseased - recessive)

Null hypothesis: The observed values are not deviating from the x linked ratio i.e. 1:1.

The expected values or ratio is 1:1.