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Exam 10: Meiosis and Sexual Life Cycles

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Question 31

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Which of the following statements is correct regarding human X and Y chromosomes?

A) They are both present in every somatic cell of males and females alike.
B) They are about the same size and have approximately the same number of genes.
C) They are almost entirely homologous,despite their different names.
D) They are responsible for the determination of an individual's sex.

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Question 32

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-A certain (hypothetical) organism is diploid,has either blue or orange wings as the consequence of one of its genes on chromosome 12,and has either long or short antennae as the result of a second gene on chromosome 19,as shown in the figure above.A certain female's number 12 chromosomes both have the blue gene and number 19 chromosomes both have the long gene.As cells in her ovaries undergo meiosis,her resulting eggs (ova) may have which of the following?

A) either two number 12 chromosomes with blue genes or two with orange genes
B) either two number 19 chromosomes with long genes or two with short genes
C) either one blue or one orange gene in addition to either one long or one short gene
D) one chromosome 12 with one blue gene and one chromosome 19 with one long gene

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Question 33

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In a cell undergoing meiosis,if centromeres of sister chromatids become disjoined and chromatids separate,what process has occurred?.

Which of the following statements best describes a karyotype?

Which phase of meiosis is represented in the figure above?

If a horticulturist breeding plants known as gardenias succeeds in having a single plant with a particularly desirable set of traits,which of the following processes would be her most probable and efficient route to establishing a line of such plants with that particular set of traits?

The karyotype of one species of primate has 48 chromosomes.In a particular female,cell division malfunctions,and she produces one of her eggs with an extra chromosome (25) .The most probable source of this error would be a mistake in which of the following processes?

Which of the following processes leads directly to the formation of gametes in a plant's sexual life cycle?

A given organism has 46 chromosomes in its karyotype.Which of the following statements is correct regarding this organism?

The somatic cells of a type of shrub called a privet each contain 46 chromosomes.To be as different as they are from human cells,which have the same number of chromosomes,which of the following must be true?

Which of the following processes happens during meiosis I?

The following question refers to the essential steps in meiosis described below. 1) formation of four new nuclei,each with half the chromosomes present in the parental nucleus 2) alignment of homologous chromosomes at the metaphase plate 3) separation of sister chromatids 4) separation of the homologs;no uncoupling of the centromere 5) synapsis;chromosomes moving to the middle of the cell in pairs Which of the steps take(s) place in both mitosis and meiosis?

Which phase of meiosis is represented in the figure above?

Figure 10.6 -Refer to Figure 10.6 above.Which of the progression of events listed corresponds to the series of events that occurs in the life cycle of animals?

Scientists have produced a hybrid plant that was the result of the fertilization of gametes between one plant with a diploid number of 24 and another with a diploid number of 20.How many chromosomes would the diploid hybrid plant have?

Which of the following structures is found in a pair of homologous chromosomes?

Which of the following events occurs in meiosis but not in mitosis?

Which of the following types of cells would be produced by meiosis?

If the DNA content of a diploid cell in the G₁ phase of the cell cycle is 24 fg (femtograms) ,then the DNA content of the same cell at metaphase of meiosis I would be