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Exam 19: Chromosomes and Cell Division

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Question 21

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________ is a syndrome that occurs in females who have only a single X chromosome (XO).

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Question 22

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Oogenesis differs from spermatogenesis in ________.

A) number of functional gametes produced
B) when it is completed
C) size of gametes produced
D) All of the above are true.

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

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Question 23

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The most appropriate form of cell division for repairing an injured tissue is ________.

A process in which a sister chromatid inherited from the mother and a sister chromatid inherited from the father pair up and form tetrads and exchange DNA to form genetically diverse gametes is called ________.

Match each definition in the first column to the correct term in the second column. -A phase in mitotic division in which the sister chromatids are pulled apart by the spindle fibers.

Each cell contains two chromosomes with genes for the same traits; these chromosomes are called ________.

An entire cell cycle can be completed in about ________.

The ________ are the 23rd pair of chromosomes that carry the traits that determine gender.

Suppose that mitosis was used to produce our gametes.What unique problems would be encountered?

The separation of daughter cells is called ________.

One out of every 800 to 1000 infants born will have three copies of chromosome 21 (Trisomy 21),a condition known as ________.

Suppose a researcher claims to be able to make a hybrid animal that is a cross between a goat and a horse.This animal has been termed "gorse." The normal diploid number for a goat is 60 and the normal diploid number for a horse is 62.Ignore the ethics here and answer the following: Based on normal meiosis,a goat gamete (haploid)should have ________ chromosomes,while a horse gamete (haploid)should have ________ chromosomes.This means we would expect our hybrid gorse to contain a total of ________ chromosomes per cell.Let's assume our researcher beats the odds and this hybrid gorse survives.Even if the hybrid survives,it is likely that it will be sterile.Referring back to the above numbers,when the hybrid produces its gametes there should be a problem.Explain what that problem will be.

What are the results of nondisjunction,and why are these chromosome alterations so detrimental to an individual?

The arrangement of an individual's chromosomes by size and centromere location is called the ________.

A baby is born with the genotype XYY.This sort of disorder is the result of nondisjunction during meiosis.In the case of the XYY genotype,can you be certain of which parent had the nondisjunction in their gamete? Explain your answer.

Which of the following characterizes Klinefelter syndrome?

Why is meiosis II needed for gamete (egg and sperm) production?

Human cells that have completed telophase I will each contain ________ chromosomes,which will be in a(n) ________ form.

Match each definition in the first column to the correct term in the second column. -The shuffling of maternal and paternal forms of genes in prophase I.

A process that parcels out the duplicated copies of genetic material for cell division in eukaryotes is called ________.