Biology 1001A Lecture Notes - Lecture 6: Sister Chromatids, Nuclear Membrane, Prometaphase

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bluerat937

23 Mar 2014

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10. 3-10. 4- genetic recombination in eukaryotes: meiosis (lecture 6) Meiosis changes both chromosome number and dna sequence: the essence of mitosis is sameness, the essence of meiosis is. Meiosis produces four genetically different daughter cells: meiosis i- homologous chromosomes find their partners and pair lengthwise, gene for gene, in a process called synapsis recombination occurs, meiosis ii- sister chromatids are separated into different cells. Prophase i: chromosomes begin to condense, each consisting of two sister chromatids, homologous chromosomes come together and pair (tetrad: a homologous pair consisting of four chromatids, chromatids of homologous chromosomes undergo recombination by exchanging segments. Anaphase i: spindle microtubules separate the two chromosomes of each homologous pair and move them to opposite spindle poles, the poles now contain the haploid number of chromosomes, but each chromosome at the pole still contains two chromatids. Telophase i second division: spindle of the first meiotic division disassembles, and two new spindles form for the.

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 is NOT TRUE about chromosomes?

Prokaryotes have a singel, circular chromosome

Eukaryotes have multiple, linear chromosomes.

Human cells normally 23 pairs of chromosomes.

Eukaryote chromosomes are composed of only DNA

Which of the following is NOT TRUE about reproduction?

Eukaryotes life cycles include a haploid and diploid phase.

Prokaryotes reproduce asexually.

Eukaryotes can propagate by asexual or sexual reproduction.

Prokaryotes typically reproduce slower than eukaryotes.

Which of the folllowing animal cells is most likely haploid?

nerve cell

muscle cell

sperm cell

liver cell

When human gametes fuse, they form a _____.

		Haploid egg
		Diploid zygote
		Haploid zygote
		Triploid egg

explain why a life cycle that includes meiosis must also include fertilization and what is the advantage of such a life cycle?
Describe some examples of how prokaryotes are helpful to humans and some examples of how they are harmful to humans?
in human life cycle, fertilization(sex) and reproduction are closely associated, yet they are very different processes. in what way are fertilization and reproduction opposite?
Describe how sperm and egg cells are different from somatic cells in number of chromosomes( in humans) the cell division process they undergo and process that generates them and the process they undergo to generate a zygote.

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Biology 1001A Lecture Notes - Lecture 6: Sister Chromatids, Nuclear Membrane, Prometaphase

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