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Exam 11: Genes, Chromosomes, and Human Genetics

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Question 21

Multiple Choice

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What typically leads to cancers associated with mammalian insulin growth factor 2 (Igf2) ?

A) duplication
B) translocation
C) X-inactivation
D) loss of imprinting

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Question 22

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Match each of the following genetic conditions with its mode of inheritance. A mode of inheritance may be used once, more than once, or not at all. -sickle cell anemia

A) autosomal recessive
B) autosomal dominant
C) X-linked recessive
D) aneuploidy
E) genomic imprinting

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Question 23

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What is caused by the human genetic condition called progeria?

Suppose you are a genetic counsellor, and a man and woman come to you with concerns that if they have a child together, it could have hemophilia. Also suppose that the woman has an X-linked recessive form of hemophilia, but the man does NOT. Which of the following is the best advice you could give them?

Which of the following describes an individual who is a carrier of a genetically inherited disease?

Which term refers to an individual with extra or missing copies of some of their chromosomes?

Which phrase best defines what is meant by gene linkage?

-In the figure, what type of change in the chromosomes is depicted?

Suppose that you examine a vial of 100 flies that are all offspring from a single genetic cross, and you find only red-eyed females and red-eyed males present. You allow these flies to interbreed, and in the next generation you find all the females are red-eyed, but you find both red-eyed and white-eyed males. The allele for red eye colour (X^w+) is dominant over the allele for white eye colour (X^w) . Which of the following best describes the genotypes of the original parents?

Which phrase best describes chromosomal nondisjunction?

Suppose that in studies of genes on the same chromosome, you find the following recombination frequencies: a 40% frequency for a and b, a 30% frequency for a and c, and a 10% frequency for b and C Which phrase best describes the relationship between genes a, b, and c?

From which studies did the discovery of sex-linked genes and the production of the first chromosome map arise?

What do genetic map units represent?

If two genes are located on different chromosomes, what percentage of the offspring should have a recombinant phenotype?

-In the figure, what type of change in the chromosomes is depicted?

Suppose that you examine a vial of 100 flies that are all offspring from a single genetic cross. Suppose also that you see that all the females present are red-eyed and all the males present are white-eyed. The allele for red eye colour (X^w+) is dominant over the allele for white eye colour (X^w) . Which of the following describes the genotypes of the parents?

Most hospitals routinely test all newborns for an autosomal recessive disorder in which an enzyme in amino acid metabolism is NOT produced. In this disorder, lack of the enzyme leads to a buildup of compounds that damage brain tissue, possibly leading to mental retardation, unless a restricted diet is followed. What is the name of this disorder?

What is the name of the human disorder in which a deletion from chromosome 5 typically leads to severe mental retardation and a malformed larynx?

Which of the following processes is most likely responsible for many mammals having multiple hemoglobin genes?

Match each of the following genetic conditions with its mode of inheritance. A mode of inheritance may be used once, more than once, or not at all. -Down syndrome