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Exam 13: Meiosis and Sexual Life Cycles

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Question 41

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When we see chiasmata under a microscope,that lets us know which of the following has occurred?

A) asexual reproduction
B) meiosis II
C) anaphase II
D) prophase I
E) separation of homologues

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Question 42

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Which of the following is true of a species that has a chromosome number of 2n = 16?

A) The species is diploid with 32 chromosomes per cell.
B) The species has 16 sets of chromosomes per cell.
C) Each cell has eight homologous pairs.
D) During the S phase of the cell cycle there will be 32 separate chromosomes.
E) A gamete from this species has four chromosomes.

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Question 43

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Whether during mitosis or meiosis,sister chromatids are held together by proteins referred to as cohesins.Such molecules must have which of the following properties?

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 tetrads at the metaphase plate 3.Separation of sister chromatids 4.Separation of the homologues; no uncoupling of the centromere 5.Synapsis; chromosomes moving to the middle of the cell in pairs -How does the sexual life cycle increase the genetic variation in a species?

Which of these is a karyotype?

When homologous chromosomes cross over,what occurs?

You have isolated DNA from cells in different stages of meiosis within one species.You have determined the relative DNA content for each type,and plotted the results on the graph shown below.Refer to the graph to answer the following questions. -Imagine that there are twenty-five different species of protists living in a tide pool.Some of these species reproduce both sexually and asexually,and some of them can reproduce only asexually.The pool gradually becomes infested with disease-causing viruses and bacteria.Which species are more likely to thrive in the changing environment?

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

Homologous chromosomes move toward opposite poles of a dividing cell during

Crossing over normally takes place during which of the following processes?

Refer to the information and figure below to answer the following question(s) . 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. -Somatic cells of roundworms have four individual chromosomes per cell.How many chromosomes would you expect to find in an ovum from a roundworm?

The generation-to-generation sequence of stages in an organism's life history is called (its)

In meiosis,when are homologous chromosomes are separated?

For the following questions,match the key event of meiosis with the stages listed below. -Tetrads of chromosomes are aligned at the equator of the spindle; alignment determines independent assortment.

For the following questions,match the key event of meiosis with the stages listed below. -Synaptonemal complexes form or are still present.

Which of the following can utilize both mitosis and meiosis in the correct circumstances?

Refer to the information and figure below to answer the following question(s) . 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. -If a female of this species has one chromosome 12 with a blue gene and another chromosome 12 with an orange gene,and has both number 19 chromosomes with short genes,she will produce which of the following egg types?

In a human karyotype,chromosomes are arranged in 23 pairs.If we choose one of these pairs,such as pair 14,which of the following do the two chromosomes of the pair have in common?

A cell divides to produce two daughter cells that are genetically different.

Which of the following happens at the conclusion of meiosis I?