BISC 102 Study Guide - Midterm Guide: Synaptonemal Complex, Cohesin, Prophase

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31 Dec 2013

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Reason why meiosis i is reductional and meiosis ii is equational Zygotes bring dna from two different parents into the same cell. (n+n=2n) Homologous chromosomes carry the same genes but different alleles: homologues have the same genes in the same places. Reductional division = during meiosis 1, the number of chromosomes is reduced from diploid to haploid, the resulting daughter cells from the parent cell are haploid: meiosis i cells are haploid. Its reductional division because the number of chromosomes (2n n) but the c-value is still 2c because there"s 2 dna molecules per chromosome. Equational = the amount of dna is reduced c-value but the number of chromosomes is not (n) In meiosis 1, chromosome number is reduced from diploid to haploid (n) In meiosis ii, the cells divide to give the daughter cells 1c the amount of dna per chromosome. In prophase of meiosis i, replicated homologues pair and recombine! Cohesin = a protein that holds chromatids together.

Related Questions

10. Make a simplified diagrammeiosis starting with a cell containing3 pairs ofchromosomes.

Include and Label: Each stageof meiosis I & II and indicate if a cell is haploid (n) ordiploid (2n); plasma membrane, nuclear envelope, sisterchromatids,separation of sister chromatids, spindle fibers/microtubules,tetrad, homologous chromosomes, separation of homologouschromosomes, cleavage furrow.

What happens to the DNA during the interphase inpreparation for meiosis?

What happens to the DNA during the interphase betweenmeiosis I and II?

How do the daughter cells compare genetically to theparent cell after....

a) meiosis I?

b) meiosis II?

What is the diploid number for the species diagrammedabove? 2n =

What is the haploid number? n=

crimsonhamster738

M2A1 Worksheet: Mitosis and Meiosis

A dog is a diploid organisms and has 39 pairs of chromosomes (2n = 78), where n = 39 chromosomes from each parent. Use this example to answer the following question regarding chromosomal number.

INTERPHASE

How many chromosomes are present in the somatic cell?

What do they look like?

What are they âdoingâ in G1 of this phase?

What is happening in the S phase?

What is happening in the G2 phase?

What follows G2 phase in a somatic cell?

What follows G2 phase in a gamete cell?

MITOSIS

Number of chromosomes in the parent cell.

Number of chromatids in the parent cell.

Number of chromosomes in the daughter cell.

Number of chromatids in the daughter cell.

How many daughter cells are produced?

Are the daughter cells haploid or diploid?

How many cell divisions take place?

In what type of cell does this division occur?

Meiosis 1:

Number of chromosomes in the parent cell.

Number of chromatids in the parent cell.

Number of chromosomes in each Meiosis I daughter cell.

Number of chromatids in each Meiosis I daughter cell.

Are the daughter cells haploid or diploid at the end of Meiosis 1?

Meiosis II:

Number of chromosomes in the âparentâ cell (which is a daughter cell from Meiosis I).

Number of chromatids in the âparentâ cell.

Number of chromosomes in each Meiosis II daughter cell.

Number of chromatids in each Meiosis II daughter cell.

Are the daughter cells haploid or diploid at the end of Meiosis II?

Which phase or phases of Meiosis account for the genetic variability among the daughter cells? Howâ¦ what happens in this phase to create the diversity?

Comparing Mitosis and Meiosisâ¦..

How many daughter cells result from Mitosis? Are they diploid or haploid?

How many daughter cells result from Meiosis? Are they diploid or Haploid?

Cell structures and function: Match each organelle to its function:

Organelle Function

Lysosome 1. Lipid synthesis

Rough ER 2. Houses DNA

Nucleus 3. Energy extraction

Smooth ER 4. Dismantles debris

Golgi apparatus 5. detoxification

Mitochondria 6. Protein synthesis

Peroxisome 7. Processes secretions

What is the function of checkpoint proteins in the cell cycle?

How can all of a personâs cells contain exactly the same genetic material, yet specialize as bone cells, nerve cells, muscle cells and connective tissues?

What are the 3 primary germ layers?

Briefly, in one or two sentences, distinguish between

a bacterial cell and a eukaryotic cell

interphase and mitosis

mitosis and apoptosis

an autosome and a sex chromosome

homologous pair of chromosomes and a sister chromatid

centromere and centriole

chromosome and chromatid

monozygotic and dizygotic twins

allele and gene

Which of the following statement(s) about meiosis and mitosisis/are correct? Select ALL that are true.

	In mitosis the daughter cells aregenetically identical, but in meiosis the daughter cells aregenetically varied.
	Mitosis and meiosis both begin withduplicated chromosomes.
	Meiosis separates homologous chromosomesso that the number of chromosomes remains constant from onegeneration to the next.
	The products of mitosis are two diploidcells, whereas the products of meiosis are four haploid cells.

When is the number of different chromosomes in a cell divided inhalf?

	mitosis
	meiosis I
	meiosis II
	both mitosis and meiosis I
	both meiosis I and meiosis II

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BISC 102 Study Guide - Midterm Guide: Synaptonemal Complex, Cohesin, Prophase

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