Genetics Chapter 3

Which of the following genotypes represents a gamete produced by a failure to segregate during meiosis in a cell of genotype AaBbCC?

AaBC

Which of Mendel's postulates can only be demonstrated in crosses involving at least two pairs of traits?

Independent Assortment

What is the basis for homology among chromosomes?

type and location of genes

Independent assortment occurs only in cells that are heterozygous for two genes (AaBb) and not in cells that are completely homozygous (AABB or aabb).

False

The larger the number of total individual counts in a chi-square test, the higher the degrees of freedom (df).

False

You would like to know whether the progeny of a pair of mated fruit flies are distributed among the resulting four phenotypic classes in a 1:1:1:1 ratio. You perform a chi-square test and obtain a p value of 0.04. Assuming you have done the test correctly, select the best interpretation of this result.

The differences between the observed and expected counts are too large to be attributed to chance.

The expected ratio of phenotypes among the progeny of a test cross is 1:1:1:1. Out of 200 total resulting progeny, 48 occur in one of the four phenotypic classes. Given this information, which of the following must also be true

The value of observed - expected for this cell = -2. (With a total of 200, the expected number in each cell when the predicted ratio is 1:1:1:1 = 50. The observed number is 48.)

Independent assortment explains _______.

why a collection of meiotic products that includes gametes of genotype Ab will also include gametes of genotype AB in roughly the same proportion