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Exam 8: Chromosomes and Human Genetics

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Question 21

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An allele that appears more frequently in males is MOST likely

A) dominant.
B) nonhomologous.
C) autosomal.
D) sex-linked.

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Question 22

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X-linked disorders more commonly affect males than females because males have only one ________ chromosome.

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Question 23

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Which of the following would explain two chromosomes in an individual cell that contain some,but not all,of the same genes at the same loci?

The chromosome on the left of the figure below is chromosome number 5 from the father of a newborn child with cri du chat syndrome.The chromosome on the right is paternal chromosome number 5 in the child.What type of chromosomal abnormality has caused this syndrome in the child? Explain your answer.

If a female who carries the X-linked recessive gene for hemophilia mates with a male who does not have hemophilia,what is the chance that their daughter will be a carrier of the gene?

In humans,X-linked genetic diseases

Match each correct statement to the set of alleles listed below. -recessive homozygous for an autosomal gene

Wiskott-Aldrich syndrome (WAS)is a sex-linked recessive blood disorder that results when an individual does not have a functional WAS gene.Explain where a functional WAS gene can be isolated and how genetic engineering could be used to treat a patient who has WAS.

Because an individual with an XX genotype is a female,is an individual with an XO (no second sex chromosome) a male?

An X-linked carrier is a female individual with a ________ genotype,on her X chromosomes,who does not express the recessive trait but can pass it along to offspring.

The pedigree shown below diagrams an X-linked gene.The individual indicated is ________ for the gene.

In humans,the "master sex switch" that determines whether an embryo will become a male is the

Both members of a couple are carriers for a recessive disease allele.If the couple has four children,which of the following statements must be true?

Does the pedigree shown below most likely represent a condition that is autosomal recessive,dominant,or sex-linked? Explain your reasoning.

Two copies of the same gene on a single chromosome would indicate a(n) ________ had occurred.

On chromosomes within an individual,there are ________ alleles for a given gene found on ________ chromosomes.

Which of the following genetic changes would NOT be passed from parent to child?

If an individual has two alleles at a given locus that are different,the individual is said to be ________ for the gene.

Match each correct statement to the set of alleles listed below. -female carrier of a sex-linked disease

Except for the sex chromosomes,all the chromosomes shown in a karyotype are numbered and are called ________.