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Exam 13: Chromosomes, Mapping, and the Meiosis-Inheritance Connection

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Question 21

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What would be the results of a test cross with the F₁ flies?

A) 1 brown eye, thin wing veins: 1 red eye, heavy wing veins
B) 1 brown eye, heavy wing veins: 1 red eye, thin wing veins
C) 1 brown eye, thin wing veins: 2 red eye, thin wing veins: 1 red eye, heavy wing veins
D) 1 brown eye, heavy wing veins: 2 red eye, thin wing veins: 1 red eye, thin wing veins

E) None of the above
F) All of the above

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Question 22

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Which offspring inherit all their mitochondrial DNA from their mother and none from their father?

A) daughters
B) sons
C) both sons and daughters
D) neither sons nor daughters

E) A) and C)
F) B) and D)

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Question 23

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In Drosophila, the sex of an individual is determined by

A deletion of a particular stretch of chromosome 15 can cause either Prader-Willi syndrome or Angelman syndrome, depending on

Amniocentesis is a procedure that is normally used

The theory of chromosomal inheritance was first proposed by

In Drosophila, dosage compensation is controlled by the male-specific lethal (MSL) complex consisting of MSL proteins and roX RNAs.Based on what you know about dosage compensation, the role of the MSL complex in males would be to

Traits that are controlled by genes located on the X chromosome are said to be ________________.

Morgan's student Sturtevant demonstrated that the recombination frequencies between a series of linked genes is additive.Examine the following recombination data from Sturtevant, and determine the proper order of the genes on the Drosophila X chromosome.Assume y is in the 0.0 position.Gene 1 Gene 2 Recombination frequency yellow(y) vermilion(y) 0.322 vermilion miniature(m) 0.030 white(w) vermiliom 0.297 yellow white 0.010 white miniature 0.337

How did the development of anonymous markers aid in the production of a human genetic map?

A 39-year-old woman is in her sixth week of pregnancy.Due to her advanced age, she is at higher risk for having a baby with Down's syndrome than younger pregnant women.She would like to find out as early as possible whether or not her baby has Down's syndrome.Her doctor should suggest

Given that these two gene loci are very closely linked, the genotypic ratio in the F₂ generation should be closest to

In humans, if non-disjunction led to an individual with a genotype of XXY, that person would

A test cross can be used to do all of the following except

Of the 23 pairs of human chromosomes, 22 pairs are homologous and are found in both males and females.These are called ________.

The classic experiments performed by Creighton and McClintock in Maize

In a two-point cross to map genes A and B, you obtained 98 recombinant types and 902 parental types among the offspring.How far apart are these genes?

Huntington's disease is caused by a single dominant allele.It is a lethal disease, yet it persists in the human population.Which of the following statements best describes why?

Which of the following will help you distinguish between the two final suspects?

Suppose you are carrying out a series of crosses with an insect where the mechanism of sex determination is unknown.You discover a mutant female with short bristles and decide to cross it with a wild type male that has normal bristles.Half of the F₁ progeny have short bristles but all of these short-bristled F₁ progeny are males.Based on these results, a valid hypothesis would be