EBIO 1210 Lecture Notes - Lecture 11: Sister Chromatids, Synapsis, Dna Replication

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blueant723

26 Oct 2016

School

CU-Boulder

Department

Ecology & Evolutionary Biology

Course

EBIO 1210

Professor

Dr.William Adams

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Document Summary

A cell at the very beginning of meiosis has a total of 4 chromatids. At the very beginning of meiosis, a cell in your ovary/testis has 46 chromosomes. At the end of meiosis i (but before meiosis ii), this cell will have given rise to two cells that are each ________ and each have ________ chromosomes and ________ chromatids. Homologous chromosomes loosely pair up, aligned gene by gene. In crossing over, non-sister chromatids exchange homologous dna segments. Pairs of homologous chromosomes line up in the middle of the cell, with one chromosome facing each pole. With first cell division complete, meiosis 1 ends. Meiosis 2 is very similar to mitosis. At the end = 4 daughter cells, all haploid, all genetically different. One, including prophase prometaphase, metaphase, anaphase, and telophase. Two, each genetically identical to the parent cell, with the same number of chromosomes. Enables multicellular animal or plant (gametophyte or sporophyte) to arise from a single cell.

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

harlequineel895

Determine whether the following applies to mitosis, meiosis, orboth; also identify the specific stage of cell division thatapplies (e.g. mitosis prophase, meiosis anaphase II, etc)

1) chromosomes pairs line up across the center of the cell

2) sister chromatids seperate

3) spindle fibers separate homologous chromosomes

4) 4 haploid daughter cells are produced

5) a cell 1st undergoes DNA replication

6) chromosomes line up single file across the middle of thecell

7) sister chromatids separate from each other

8) 2 haploid daughter cells form

9) the nuclear membrane re forms

10) spindle fibers attach to pairs of homologous chromosomes

11) the nuclear membrane begins to dissolve

12) centrosomes duplicate

13) synapsis and crossing over occurs

14) 2 diploid daughter cells form

turquoiseporpoise808

-Complete the following sentences: metaphase of mitosis, prophase II of meiosis, crossing over, anaphase I of meiosis, variable, random fertilization, identical, random orientation, metaphase I of meiosis, prophase I of meiosis, metaphase II of meiosis, reduction division

Two processes that occur during meiosis produce genetically ____________ cells.

In a process called ____________ , paired homologous chromosomes align randomly at the cell equator. This occurs during this stage of cell division: ____________ .

In a process called ____________ , genetic material is exchanged between homologous chromosomes. This occurs during this stage of cell division: ____________ .

-Complete the following paragraph to describe nondisjunction and the resulting effects on chromosome number.

words: euploidy, primary nondisjunction, nomal, nondisjunction, secondary nondisjunction, homologous chromosomes, abnormal, trisomy, monosomy, sister chromatids, aneuploid

1.During meiosis I, ____________ separate and move towards opposite ends of the poles.

2.During meiosis II, ____________ separate and move towards opposite ends of the poles.

3.During meiosis I, if both members of a homologous pair go into the same daughter cell, ____________ is said to occur and no normal gametes are produced.

4.During meiosis II, if the sister chromatids fail to separate and both daughter chromosomes go into the same gamete, ____________ is said to occur. Half the gametes are aneuploid while the other half are euploid.

5.If an egg that contains 24 chromosomes instead of 23 chromosomes is fertilized by a normal sperm, ____________ is said to have occurred.

6.If an egg that contains 22 chromosomes instead of 23 chromosomes is fertilized by a normal sperm, ____________ is said to have occurred.

EBIO 1210 Lecture Notes - Lecture 11: Sister Chromatids, Synapsis, Dna Replication

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