LSC 347 Module 1.1 Ch 3 Exams Questions and Answers
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LSC 347 Module 1.1 Ch 3
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LSC 347 Module 1.1 Ch 3
LSC 347 Module 1.1 Ch 3
The phenotype of vestigial (short) wings (vg) in Drosophila melanogaster is caused by a recessive mutant gene that independently assorts with a recessive gene for hairy (h) body. Assume that a cross is made between a fly with normal wings and a hairy body and a fly with v...
LSC 347 Module 1.1 Ch 3
The phenotype of vestigial (short) wings (vg) in Drosophila melanogaster is caused
by a recessive mutant gene that independently assorts with a recessive gene for
hairy (h) body. Assume that a cross is made between a fly with normal wings and a
hairy body and a fly with vestigial wings and normal body hair. The wild-type F1 flies
were crossed among each other to produce 1024 offspring. Which phenotypes would
you expect among the 1024 offspring, and how many of each phenotype would you
expect? - Answer- Phenotypes: wild, vestigial, hairy, and vestigial hairy; Numbers
expected: wild (576), vestigial (192), hairy (192), and vestigial hairy (64).
Which of the following is characteristic of the offspring of a dihybrid cross? - Answer-
6/16 is homozygous recessive for one trait
The autosomal (not X-linked) gene for brachydactyly, short fingers, is dominant to
normal finger length. Assume that a female with brachydactyly in the heterozygous
condition is married to a man with normal fingers. What is the probability that their
first two children will have brachydactyly? - Answer- 1/4
In what ways is sample size related to statistical testing? - Answer- By increasing
sample size, one increases the reliability of the statistical test and decreases the
likelihood of erroneous conclusions from chance fluctuations in the data.
Which of the following best describes the relationship at the molecular level between
mutant alleles and phenotype? - Answer- A mutant allele can have different effects
depending on the gene product's function.
PreviousNext
What conditions are likely to apply if the progeny from the cross AaBb × AaBb
appear in the 9:3:3:1 ratio? - Answer- complete dominance, independent assortment,
and no gene interaction
Which of the following is characteristic of the offspring of a dihybrid cross? - Answer-
6/16 has recessive phenotype in 1 trait, and 1/16 is recessive phenotype in 2 traits
The autosomal (not X-linked) gene for brachydactyly, short fingers, is dominant to
normal finger length. Assume that a female with brachydactyly in the heterozygous
condition is married to a man with normal fingers. What is the probability that their
first child will be a brachydactylous girl? - Answer- 1/4
In a Chi-square test, as the value of the χ2 increases, the likelihood of rejecting the
null hypothesis ________. - Answer- increases
What are the possible conclusions for the inheritance of traits in the following
pedigree? - Answer- both parents are heterozygotes, and recessive
Under what conditions does one expect a 1:1:1:1 ratio? - Answer- AaBb x aabb
, Which of the following is characteristic of the offspring of a dihybrid cross? - Answer-
6/16 is homozygous recessive for one trait, and 1/16 is homozygous recessive for 2
traits
What meiotic process, relative to the number of chromosomes of a given species,
accounts for a significant amount of genetic variation in gametes? - Answer-
independent assortment of chromosomes
In what ways is sample size related to statistical testing? - Answer- By increasing
sample size, one increases the reliability of the statistical test and decreases the
likelihood of erroneous conclusions from chance fluctuations in the data.
What are the possible conclusions for the inheritance of traits in the following
pedigree? - Answer- recessive trait, and F1 generation affected individual is
homozygote
Two organisms, AABBCCDDEE and aabbccddee, are mated to produce an F1 that
is self-fertilized. If the capital letters represent dominant, independently assorting
alleles. What proportion of the F2 genotypes will be recessive for all five loci? -
Answer- 1/243
Which of the following is characteristic of the offspring of a dihybrid cross? - Answer-
4/16 is homozygous for 2 traits, and 4/16 is heterozygous for 2 traits
Albinism, lack of pigmentation in humans, results from an autosomal recessive gene
(a). Two parents with normal pigmentation have an albino child. What is the
probability that their next child will be an albino girl? - Answer- 1/8
Which of the following is true? - Answer- Assume that a Chi-square test was
conducted to test the goodness of fit to a 3:1 ratio and that a Chi-square value of
2.62 was obtained. The null hypothesis should be accepted.
What are the possible conclusions for the inheritance of traits in the following
pedigree? - Answer- both parents are heterozygotes, and recessive
According to Mendel's model, because of the ________ of chromosomes during
meiosis, all possible combinations of gametes will be formed in equal frequency. -
Answer- independent assortment
Which of the following is characteristic of the offspring of a dihybrid cross? - Answer-
1/16 is homozygous recessive for 2 traits, and 6/16 is homozygous recessive for one
trait
According to Charles Darwin and Alfred Wallace, variations followed a more
continuous pattern. According to Mendel's model, variation due to dominance-
recessive relationships followed a more ________ form. - Answer- discontinuous
The F2 generation in one of Mendel's dihybrid crosses constituted:
315 round yellow
108 round green
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