BIOL2000 Lecture Notes - Lecture 17: Sister Chromatids, Karyotype, Primordial (Band)

44 views5 pages

magentamarten253

9 Apr 2016

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

2 homologs of each chromosome in each cell: 2 copies of the same chromosome (same genes) Haploid number=n: 23 indicates number of distinct types of chromosomes present in an organism"s cells, gametes are haploid, # of distinct chromosomes. Diploid number=2n: two copies of each chromosome. Meiosis: production of sperm and egg (sex cells, have to reestablish the diploid number. All the mitochondria are donated by the mom: primordial germ cells undergo meiosis. Not the same as regular somatic cells. Pgcs are set aside early in development and undergo meiosis and differentiate in gametes. During puberty, pgcs stop dividing mitotically and start dividing through meiosis. One diploid pgc will undergo meiosis to form 4 sperm: female. Egg pgcs begin meiosis 1 immediately after birth but arrest until puberty. Onset of adolescence signals groups of oocytes to mature and periodically resume meiosis to form eggs. Millions at birth and 400 mature during your lifetime: nomenclature.

Related Questions

Match the terms to the definitions provided.

Question 1 options:

	gamete
	somatic cells
	zygote
	sexual reproduction

1.	Reproductive life cycle that involves an alternation between haploid and diploid cells
2.	A single cell with a diploid number of chromosomes resulting from the fusion of an egg and a sperm.
3.	Cells (egg or sperm) resulting from a meiotic division of germ-line cells
4.	The non-reproductive cells found in embryos and mature individuals

Question 2 (5 points)

Match the terms to the definitions provided.

Question 2 options:

	syngamy
	haploid
	meiosis
	diploid
	germ-line cells

1.	The cells that will eventually undergo meiosis to produce gametes.
2.	The number of chromosomes found in gametes (eggs or sperm).
3.	The process by which two haploid gametes fuse to form a new diploid cell.
4.	A specialized reduction division that produces cells with half the normal number of chromosomes.
5.	Two sets of chromosomes present in the somatic cells of adult individuals.

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!

What is the purpose of meiosis?

To enable an organism to produce gametes

To allow for growth

To allow an organism to replace damaged cells

Question 2

Select one answer.

10 points

Mitosis results in ________ and meiosis results in ________.

gametes, somatic cells

gametes, gametes

somatic cells, somatic cells

somatic cells, gametes

Question 3

Select one answer.

10 points

Which of the following tasks is accomplished through the processof meiosis?

Cell growth

Production of sperm or eggs

Replacement of dysfunctional cells

Question 4

Select one answer.

10 points

What advantage does sexual reproduction have over asexualreproduction?

All other selections are true.

Sexual reproduction provides more genetic variability

Sexual reproduction doubles the number of chromosomes in aspecies

Sexual reproduction is more efficient

Question 5

Select one answer.

10 points

Crossing over occurs between homologous chromosomes during whatstage of cell division? (Read each option carefully.)

Prophase I of meiosis

Prophase of mitosis

Prophase II of meiosis

Interphase

Question 6

Select one answer.

10 points

Corn has 20 chromosomes. When corn undergoes meiosis how manychromosomes are found in the gametes?

Question 7

Select one answer.

10 points

Homologous chromosomes separate and are pulled to opposite sidesof the cell during what stage of cell division? (Read each optioncarefully.)

Metaphase I of meiosis

Anaphase II of meiosis

Anaphase I of meiosis

Anaphase of mitosis

Question 8

Select one answer.

10 points

Mitosis results in ______ cells and meiosis results in _______cells.

diploid, haploid

haploid, diploid

diploid, diploid

haploid, haploid

jadepug655

BIOL2000 Lecture Notes - Lecture 17: Sister Chromatids, Karyotype, Primordial (Band)

Document Summary

Get access

Related Documents

BIOL2000 Lecture Notes - Lecture 10: Ploidy, Sister Chromatids, Chromosome Segregation

BIOL2000 Chapter Notes - Chapter 13: Telophase, Metaphase, Synapsis

BIOL2000 Lecture Notes - Lecture 11: Blending Inheritance, Reciprocal Cross, Mendelian Inheritance

Related Questions