Mastering Genetics Chapter 3 HW
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. -
observed and expected counts are too large to be attributed to chance.
The larger the number of total individual counts in a chi-square test, the higher the degrees of freedom
(df). -
False
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.
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
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
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
Which of the following would be true of a plant heterozygous for a single gene controlling flower
color? -
If crossed with another heterozygous plant, the majority of progeny will have the dominant
flower color.
The 3:1 phenotypic ratio observed among progeny of an F1 X F1 cross requires random union of
gametes. -
true
Of the methods listed below, which would be the best way to determine which of two alleles of a gene
is dominant to the other? -
Observe the relevant phenotype in the progeny that result from a cross between individuals
from two different pure-breeding lines
