BIOL 1030 Lecture Notes - Lecture 13: Synapsis, Dna Replication, Mitosis

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13 Mar 2018

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Biol 1030 lecture 13 cell division: meiosis. In eukaryotes, chromosomes come in pairs: half genes come from the mother and the other half of the genes come from the father. Egg + sperm = fertilization: after fertilization mitosis and development occurs, multicellular diploid adults (2n = 46, haploid gametes (n = 23) There are a variety of different life cycles depending on when mitosis, meiosis and fertilization happen. In the animals most of the fertilization occurs in the diploid. In most fungi and some protists most of the fertilization occurs in the haploid. In plants and some algae most of the fertilization occurs in both haploid and diploid: homologous matching pair of chromosomes. Mitosis : dna replication occurs during interphase before mitosis begins, only one division. Two daughter cells, genetically identical to the parent cell. Meiosis : dna replication occurs during interphase before meiosis begins. Four daughter cells, genetically different from parent cell.

Related Questions

1. Does the parent cell in Mitosis start off as diploid or haploid? Are the resulting cells at the end of Mitosis diploid or haploid?

2.Does the parent cell in Meiosis start off as diploid or haploid? Are the resulting cells at the end of Meiosis diploid or haploid?

3.How does the number of chromosomes in sperm/egg compare with the number of chromosomes in the parent cell?

1. Identify whether each process below occurs during mitosis, meiosis,or both.

b. Haploid cells are formed -

c. Cell division occurs only once

d. Homologous chromosomes pair

e. 4 haploid cells are the final result

g. Cell division occurs twice -

h. Replicated chromosomes line up in the middle of the cell

i. 2 diploid cells are the final result _

Which of the following statements are false about the comparison between mitosis and meiosis? Select all. that apply.

1.Two cytokinesis events occur in mitosis but only one in meiosis

2.Meiosis results in half the number of homologous chromosome pairs as the original cell whereas mitosis has the same number as the original cell

3. Mitosis occurs in somatic cells while meiosis only occurs in germ cells

4.Both haploid and diploid cells undergo mitosis and meiosis

5.Both mitosis and meiosis have one round of DNA replication in the preceding Interphase period

6. Chromosomes undergo disjunction in mitosis but not in meiosis

7.Meiosis leads to a reductive division in the number of chromosomes whereas mitosis does not

Thank you!

Which of the following statements are false about the comparison between mitosis and meiosis? Select all. that apply. Multiple answers: You can select more than one option A Two cytokinesis events occur in mitosis but only one in meiosis B Meiosis results in half the number of homologous chromosome pairs as the original cell whereas mitosis has the same number as the original cell C Mitosis occurs in somatic cells while meiosis only occurs in germ cells D Both haploid and diploid cells undergo mitosis and meiosis E Both mitosis and meiosis have one round of DNA replication in the preceding Interphase period F Chromosomes undergo disjunction in mitosis but not in meiosis G Meiosis leads to a reductive division in the number of chromosomes whereas mitosis does not Unanswered

BIOL 1030 Lecture Notes - Lecture 13: Synapsis, Dna Replication, Mitosis

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