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300845 Lecture Notes - Lecture 5: Cell Division, Meiosis, Mitosis

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School
UWS
Department
University of Western Sydney
Course
300845
Professor
anonymous

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Document Summary

Two rounds of cell division result in the formation of gametes which are genetically haploid= contain only one copy of each pair of homologous chromosomes. Meiosis is specialized type of cell division which occurs only in reproductive cells= germ cells. Each daughter cell contains only one member of each homologous pair of chromosomes. Cell division occurs in the absence of chromosome duplication. Sister chromatids separate at anaphase (as in mitotic division) Mitosis produces two cells which contain both members of each pair of homologous chromosomes= genetically diploid. Meiosis produces four cells each of which contains one copy of each pair of homologous chromosomes= genetically haploid. Mitosis makes exact copies, maintains exact numbers of chromosomes, diploid to diploid- has o do with growth and repair. Meiosis makes exact copies then mixes alleles and reduces the chromosomes number to form gametes- diploid to haploid. Reduction of chromosome number and division of chromatids.

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Related Questions

1. only one chromosome of a homologous pair is present in a cell

2. sister chromatids seperate

3. homologous chromosomes pair up

4. parent cell and daughter cells are genetically identical to each other

5. chromosomes replicate before nuclear division

6. crossing over

7. involved in growth and repair

8. homologous chromosomes separate

9. synthesis of sister chromatids before division

10. independent assortment

Answer Choices:

A. occurs ONLY in meiosis

B. occurs in BOTH mitosis and meiosis

C. occurs ONLY in mitosis

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?

4.

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 _

Indicate whether the following outcomes of cell division are observed in mitosis only, meiosis only, or both mitosis and meiosis. Sister chromatids are separated. mitosis only meiosis only both mitosis and meiosos Contains only one cellular division mitosis only both mitosis and meiosos meiosis only DNA is replicated prior to cell division. both mitosis and meiosos mitosis only meiosis only A diploid parent cell produces haploid daughter cells. mitosis only both mitosis and meiosos meiosis only Daughter cells are genetically identical to parent cell. meiosis only