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Bio Test chapter 7
Terms in this set (28)
Most of the traits expressed in a person's phenotype are determined by
Which of the following phrases is true of X chromosome inactivation?
occurs in cells of female mammals
Which statement is true of a sex-linked recessive gene?
In an XY male, this recessive gene is always expressed.
Much of what we know about single-gene traits in humans is the result of studying
What is the main difference between the carrier of a sex-linked disorder and the carrier of an autosomal disorder?
The carrier of a sex-linked disorder is always female but does not have the disorder.
A chart that traces the phenotypes and genotypes within a family is called a
A genetic disorder is traced within a family. The disorder occurs mostly in males. The gene for this disorder is most likely
on the X chromosome.
A person who has a disorder caused by a recessive allele is
homozygous for the recessive allele.
Gene expression is influenced by many factors. Which of the following is a factor in gene expression?
The Punnett square in Figure 7.1 shows a cross between two parents who have the genotype Ss for a genetic disorder caused by a recessive allele. Which of the following will have the genetic disorder?
Two parents have the genotype Gg for a genetic disorder caused by a dominant allele. What is the chance that any of their children will inherit the disorder?
For an XX female to express a recessive sex-linked trait, she must have
two recessive alleles.
Human height occurs in a continuous range because it is affected by the interaction of several genes, making it a
Suppose a mouse is homozygous for alleles that produce black fur and homozygous for alleles of an epistatic gene that prevents fur coloration. What color fur will the mouse have?
Two genes cross over 6% of the time. This percentage means that the genes are
not inherited together in 6 out of 100 offspring.
A female is born with attached earlobes, which is a recessive phenotype. Which of the following genotypes could her parents have?
Rr and rr
Some members of a family have a recessive sex-linked disorder. Which of the following statements about the family would be true?
Only females would be carriers.
What is the main reason that sex-linked disorders are most often observed in males?
The Y chromosome cannot mask alleles on the X chromosome.
Which of the following tools is used to match up chromosome pairs using chemical stains?
Someone who is heterozygous for a recessive allele that causes a disorder
will not have the disorder.
The Punnett square in Figure 7.1 shows a cross between two parents who are heterozygous for an autosomal genetic disorder caused by a recessive allele. People with which genotype will have the disorder?
One parent is homozygous for a recessive allele and one parent is heterozygous for a recessive allele in an autosomal dominant genetic disorder. What is the chance that a child of those two parents will have the disorder?
An XX female will express a recessive sex-linked trait if she
is homozygous for the recessive allele
Suppose a mouse is homozygous for alleles that produce black fur and homozygous for alleles of an epistatic gene that produces albinism. What color fur will the mouse have?
The crossing of wild type fruit flies with mutant fruit flies resulted in the conclusion that some
traits are inherited as a group.
Two genes on a linkage map are 9 map units apart. This means that in 9 percent of the offspring, the phenotypes from those genes will
not appear together.
A female is born with attached earlobes, which is a recessive phenotype. Which of the following statements about her parents must be true?
Both parents have the recessive allele.
If more males than females in a family have a recessive sex-linked disorder, what can you infer about patterns of inheritance in that family?
Only females would be carriers of the disorder.
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