BIOL 3301 Genetics Exam 1 (Chapters 1-5)
questions and answers new update Meisel
& Dauwalder University of Houston
,University of Houston 2018 Test 1
Chapters 1-5,17
Chi Square Test
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 traits being studied are on separate chromosomes.
-Approximately 4% of the offspring lie outside the range of values expected for a 1:1:1:1 ratio.
-The phenotypic ratio is actually 9:3:3:1
-The differences between the observed and expected counts are too large to be attributed to
chance.
The differences between the 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).
T/F
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.
-The progeny of this cross do not conform to a 1:1:1:1ratio.
-Since 48 is so close to the expected value, there is no need to calculate chi square before
drawing a conclusion about the ratio.
-At least one additional cell must also contain a count of 48.
The value of observed - expected for this cell = -2.
In an individual that is heterozygous for a particular trait, expression of the recessive allele is
masked.
T/F
True
, Round (R) seed shape is dominant to wrinkled (r) seed shape in pea plants. If an RR plant is
crossed with an rr plant, what is the frequency of phenotypes in the F2 generation?
We have an expert-written solution to this problem!
If the first three F2 offspring grown from the cross described above are round, what is the
probability that the next F2 offspring will be wrinkled?
-100%
-75%
-0%
-25%
25%
Separation of sister chromatids occurs _______.
-at anaphase in mitosis and anaphase II in meiosis
-in meiosis, but not in mitosis
-at anaphase II in mitosis and anaphase in meiosis
-in mitosis, but not in meiosis
at anaphase in mitosis and anaphase II in meiosis
The end result of meiosis is four haploid daughter cells.
T/F
True
Novel combinations of genes can arise from _______.
-reciprocal exchange of DNA between sister chromatids during prophase
-reciprocal exchange of DNA between homologs during prophase I
-reciprocal exchange of DNA between homologs during prophase II
-the alignment of chromosomes at Metaphase II
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