Biology 111- Chapter 15 Test Bank Questions & Answers 100% Correct!!
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Biology 111-
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Biology 111-
When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to each other, the F2 generation included both red- and white-eyed flies. Remarkably, all the white-eyed flies were male. What was the explanation for this result? - ANSWER The gene involved is on the X chromosome.
Which of the fo...
Biology 111- Chapter 15 Test Bank
Questions & Answers 100% Correct!!
When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to each other, the F2 generation
included both red- and white-eyed flies. Remarkably, all the white-eyed flies were male. What was
the explanation for this result? - ANSWER The gene involved is on the X chromosome.
Which of the following is the meaning of the chromosome theory of inheritance as expressed in the
early twentieth century? - ANSWER Mendelian genes are at specific loci on the chromosome and, in
turn, segregate during meiosis.
Males are more often affected by sex-linked traits than females because _____. - ANSWER males are
hemizygous for the X chromosome
SRY is best described as _____. - ANSWER a gene region present on the Y chromosome that triggers
male development
In cats, black fur color is caused by an X-linked allele; the other allele at this locus causes orange
color. The heterozygote is tortoiseshell. What kinds of offspring would you expect from the cross of a
black female and an orange male? - ANSWER tortoiseshell females; black males
Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal color
vision have a color-blind son. What are the genotypes of the parents? - ANSWER XNXn and XNY
Cinnabar eyes is a sex-linked, recessive characteristic in fruit flies. If a female having cinnabar eyes is
crossed with a wild-type male, what percentage of the F1 males will have cinnabar eyes? - ANSWER
100%
Normally, only female cats have the tortoiseshell phenotype because _____. - ANSWER a male
inherits only one allele of the X-linked gene controlling hair color
In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A
recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in
pigeons. What would be the sex ratio in the offspring of a cross between a male that is heterozygous
for the lethal allele and a normal female? - ANSWER 2:1 male to female
, Sex determination in mammals is due to the SRY gene. Which of the following could allow a person
with an XX karyotype to develop a male phenotype? - ANSWER translocation of SRY to a X
chromosome
A recessive allele on the X chromosome is responsible for red-green color blindness in humans. A
woman with normal vision whose father is color blind marries a color-blind male. What is the
probability that this couple's first son will be color blind? - ANSWER 1/2
A man who carries an allele of an X-linked gene will pass it on to _____. - ANSWER all of his
daughters
Glucose-6-phosphate dehydrogenase deficiency (G6PD) is inherited as a recessive allele of an X-
linked gene in humans. A woman whose father suffered from G6PD marries a normal man. - ANSWER
(a) 1/2; (b) no
Sturtevant provided genetic evidence for the existence of four pairs of chromosomes in Drosophila in
which of these ways? - ANSWER Drosophila genes cluster into four distinct groups of linked genes.
Which of the following statements is true of linkage? - ANSWER The closer two genes are on a
chromosome, the lower the probability that a crossover will occur between them.
How would one explain a testcross involving F1 dihybrid flies in which more parental-type offspring
than recombinant-type offspring are produced? - ANSWER The two genes are closely linked on the
same chromosome.
What does a frequency of recombination of 50% indicate? - ANSWER The two genes are likely to be
located on different chromosomes.
What is the definition of one map unit? - ANSWER a 1% frequency of recombination between two
genes
Recombination between linked genes comes about for what reason? - ANSWER Crossovers between
these genes result in chromosomal exchange.
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