Which of the following best describes the role of recombination in genetic variation? Group of answer choices It ensures that each gamete receives one copy of each chromosome It allows for randomly shuffling alleles during gamete formation It involves the exchange of genetic material between non-homologous chromosomes It creates new combinations of alleles on the same chromosome during crossing over

Which of the following best describes the role of recombination in genetic variation? Group of answer choices It ensures that each gamete receives one copy of each chromosome It allows for randomly shuffling alleles during gamete formation It involves the exchange of genetic material between non-homologous chromosomes It creates new combinations of alleles on the same chromosome during crossing over

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter20: The Reproductive System

Section: Chapter Questions

Problem 11RE

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Which of the following statements is not true in comparing mitosis and meiosis? a. Twice the number of cells are produced in meiosis as in mitosis. b. Meiosis is involved in the production of gametes, unlike mitosis. c. Crossing over occurs in meiosis I but not in meiosis II or mitosis. d. Meiosis and mitosis both produce cells that are genetically identical. e. In both mitosis and meiosis, the parental cell is diploid.
VISUALIZE Draw a simple sketch illustrating how nondisjunction in meiosis can lead to Down syndrome.
What processes are responsible for the generation of genetic variation during meiosis, and at what point in meiosis does each occur? Random alignment and separation of homologs that takes place during metaphase I and anaphase I, respectively. Independent assortment of homologous that takes place during anaphase II. Crossing over of non-sister chromatids that take place during prophase I. Replication of DNA during the S phase.
Place the events of meiotic crossover in order of their occurrence, from the start of prophase I to the start of metaphase I. Prophase I Metaphase I Answer Bank Chromosomes begin to condense. Chromosomes condense further as chiasmata become more visible during separation. The synaptonemal complex aligns homologs into tetrads. Crossing over occurs, during which non-sister chromatids exchange DNA. Homologs are connected by chiasmata as the synaptonemal complex begins to separate.
Identify two ways meiosis contributes to genetic recombination? Why is it necessary to reduce the number of chromosomes in gametes? Blue whales have 44 chromosomes in every cell. Determine how many chromosomes you would expect to find in the following: Cachalot whale Egg cell Daughter cell from mitosis Daughter cell from mitosis II
Consider a diploid organism that follows the XX-XO mode of sex determination. Normally, there are 7 chromosomes in its somatic cell. The chromosomal composition is as follows: Chromosome I is a large acrocentric chromosome Chromosome II is a large telocentric chromosome Chromosome III is a small telocentric chromosome Chromosome IV (X chromosome) is a medium submetacentric chromosome Aneuploidy was observed in a particular individual wherein there are three copies of Chromosome III. Diagram how aneuploidy may occur through Mitosis starting from a parent cell at G1 phase. Make sure to distinguish between chromosomes and the following phases of cell division (G1 phase, prophase, metaphase, anaphase, telophase, cytokinesis). Indicate the chromosome equation and chromosome number of the parent cell and the daughter cells. *S phase and G2 phase purposefully excluded
Consider a diploid organism that follows the XX-XO mode of sex determination. Normally, there are 7 chromosomes in its somatic cell. The chromosomal composition is as follows: Chromosome I is a large acrocentric chromosome Chromosome II is a large telocentric chromosome Chromosome III is a small telocentric chromosome Chromosome IV (X chromosome) is a medium submetacentric chromosome Aneuploidy was observed in a particular individual wherein there are three copies of Chromosome III. Illustrate the source of aneuploidy if it occurs in Meiosis I. Diagram spermatogenesis starting with the primary spermatocyte up to spermatozoa, making sure to distinguish between chromosomes and the different phases of meiosis I (prophase I*, metaphase I, anaphase I, telophase I). Indicate the respective chromosome equation and chromosome number of the primary spermatocyte, secondary spermatocyte, spermatid, and spermatozoon.
What is crossing over and where does it occur in meiosis? Why is crossing over important for creating genetic diversity?
Which of the following statements about mitosis and meisois are TRUE? (check all that apply) Mitosis produces genetically identical cells, whereas meiosis produces genetically variable (different) cells. Mitosis consists of a single nuclear division, whereas meiosis consists of two nuclear divisions. DNA replication occurs prior to mitosis and meiosis I. Crossing over occurs in both meiosis I and meiosis II. The number of chromsoomes in newly formed cells is the same as the mother cell in both mitosis and meiosis. 00000
Which of the following chromosomal rearrangements usually results in normal meiosis? translocation homozygote translocation heterozygote paracentric inversion heterozygote pericentric inversion heterozygote
What is meant by incomplete linkage? What does this have to do with pairing of chromosomes during meiosis?
In which behaviour of chromosomes do mitosis and meiosis differ from each other? In meiosis, homologous chromosomes lie in pairs but don't cross over; whereas, in mitosis, chromosomes remain separate and undergo crossing overr. In meiosis, homologous chromosomes don’t lie in pairs and don't undergo crossing over; whereas, in mitosis, chromosomes lie in pairs and get crossed over. In mitosis, chromosomes, as a whole, move towards the opposite poles; whereas, in meiosis I, chromatids move towards the opposite poles. In meiosis, homologous chromosomes lie in pairs, and form chiasmata; whereas, in mitosis homologous chromosomes dont undergo synapsis or crossing over.