12. Meiosis

Mitosis & Meiosis Review

Differences between Mitosis and Meiosis | Don't Memorise

Daughter cells of mitosis and meiosis II are both diploid while the daughter cells of meiosis I are haploid.

The number of chromosomes in daughter cells of meiosis I is half the number of chromosomes of the parent cell.

The number of chromosomes in daughter cells of mitosis and meiosis II is equal to the number of chromosomes in the parent cells.  

What does it mean when we say that mitosis and meiosis II are forms of “equational division” while meiosis I is a form of “reductional division”?a) Daughter cells of mitosis and meiosis II are both diploid while the daughter cells of meiosis I are haploid. &nbsp;b) The number of chromosomes in daughter cells of meiosis I is half the number of chromosomes of the parent cell. &nbsp;c) The number of chromosomes in daughter cells of mitosis and meiosis II is equal to the number of chromosomes in the parent cells. &nbsp;d) A and B.e) B and C.f) All of the above.

 In terms of energetic costs, sexual reproduction is a cheaper strategy than asexual reproduction for generating genetic variation in a population. 

 No. Although sexual reproduction can greatly increase the genetic variation in a population, its energetic costs are higher than those for asexual reproduction. 

 Although sexual and asexual reproduction both offer opportunities for increasing genetic variation, sexual reproduction is comparatively lower in its energetic costs to the organism. 

 No. Asexual reproduction alone does not lead to increased genetic variation in a population, and sexual reproduction has higher energetic costs than asexual reproduction. 

 Sexual reproduction maintains the same combination of alleles and does not run the risk of losing successful combinations of alleles as is observed to occur in asexually reproducing organisms. 

 No. Sexual reproduction generates new combinations of alleles, whereas asexual reproduction perpetuates the same allele combination within individuals across generations. 

 Although both reproductive strategies perpetuate the same combination of alleles within individuals in a population, sexual reproduction is energetically less costly than asexual reproduction. 

 No. Sexual reproduction generates new and different combinations of alleles but is energetically more costly than asexual reproduction. 

 Although energetically more costly than asexual reproduction, sexual reproduction leads to different combinations of alleles that could provide adaptability in a changing environment. 

Consider the influence that the two reproductive strategies have on genetic variation in a population, the importance of that variation in variable environments, and the energetic costs for each reproduction mode.

Which of the following statements reflects an advantage that sexual reproduction likely provides over asexual reproduction?

Comparing mitosis and meiosis | Cells | MCAT | Khan Academy

Sister chromatids align along the metaphase plate in mitosis while homologous chromosomes align in meiosis II.

Sister chromatids separate in mitosis and homologous chromosomes separate in meiosis II.

Meiosis II occurs in a haploid cell, while mitosis occurs in a diploid cell.

Crossing over of chromosomes takes place in meiosis II and does not take place in mitosis.

Which of the following statements describes a difference between meiosis II and mitosis in a diploid organism?a) Sister chromatids align along the metaphase plate in mitosis while homologous chromosomes align in meiosis II.b) Sister chromatids separate in mitosis and homologous chromosomes separate in meiosis II.c) Meiosis II occurs in a haploid cell, while mitosis occurs in a diploid cell.d) Crossing over of chromosomes takes place in meiosis II and does not take place in mitosis.

During which of the following processes do sister chromatids separate from each other?a) During meiosis I only.b) During meiosis II only.c) During both mitosis and meiosis I.d) During both mitosis and meiosis II.

Mitosis and Meiosis

 asexual reproduction; have achieved great diversity by using sexual reproduction 

 No. Asexual reproduction is not the prevailing mode of reproduction among animals. 

 sexual reproduction; reproduce asexually and achieve genetic diversity by mutations alone 

 No. Sexual reproduction is the prevailing mode of reproduction among animals, but bdelloid rotifers have evolved an alternate means of generating genetic diversity within populations other than by mutation. 

 sexual reproduction; reproduce asexually because they inhabit very stable environments and the production of gametes would be an inefficient use of energy 

 No. Sexual reproduction is the prevailing mode of reproduction among animals, but the seasonal change in the habitats of bdelloid rotifers can be significant. 

 sexual reproduction; reproduce asexually but can increase genetic variation present in a population by means of the uptake of DNA from other rotifers 

Think about the factors that have contributed to the evolutionary success of animals and how bdelloid rotifers are an exception that proves the rule.

Although __________ is nearly universal among animals, bdelloid rotifers __________.

Mitosis & Meiosis Review Example 1

Mitosis vs Meiosis | Biology

Chromosome replication during interphase.

Alignment of chromosomes at the center of the cell.

Condensation of chromosomes during prophase.

Which of the following processes occurs in meiosis but not in mitosis?a) Chromosome replication during interphase.b) Synapsis of chromosomes during prophase.c) Alignment of chromosomes at the center of the cell.d) Condensation of chromosomes during prophase.e) None of the above.

Mitosis vs. Meiosis: Side by Side Comparison

 Decreasing the chromosome number to haploid 

 No. This statement is true, but there is a better response. 

 Introducing genetic variation among the daughter cells 

 Ensuring that each daughter cell gets a single, complete set of chromosomes 

 All of the listed responses are correct. 

Review the events of mitosis and meiosis.

Which function makes meiosis lengthier and more complex than mitosis?

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