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Imagine an organism whose diploid chromosome number is 6, and draw a cell as it appears at the beginning of anaphase I of meiosis. Draw as many cells as are present at that time, and depict all the following that are present: the cell membrane, the nuclear membrane, the centrosomes, and spindle fibers, and the chromosomes. Depict any recombination that has already occurred as accurately as possible, as well as any significant event(s) that is(are) happening involving the chromosomes.

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Lelia Lubowitz
Lelia LubowitzLv2
28 Mar 2019

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Related questions

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

1). Explain the significance of the fact that gametes contain half of the chromosome complement of somatic cells. Tell me something about variation, if you have a sibling (if you don't imagine you do) - how is your sibling's genetic make-up similar and/or different from yours? What about your mom and dad?

2). Explain the terms reductional division and equational division. What is reduced or kept equal? To which nuclear divisions do these terms refer?

3). What is the diploid number (2n = ?) of an organism if it has
a) 12 chromosomes at Anaphase of Mitosis?
b) 12 chromosomes at Anaphase I of Meiosis?
c) 12 chromosomes at Anaphase II of Meiosis?

4). Compare/contrast Metaphase I of Meiosis with Metaphase of Mitosis.

5). What are the two mechanisms of variation in Meiosis, and during which stage(s) does each occur?

6). Draw a diagram of a bivalent and label the following parts: centromere, sister chromatids, non-sister chromatids, homologous chromosomes, chiasma.

7). A diploid cell has 1 pair of acrocentric chromosomes (Chromosome 1) and 1 pair of submetacentric chromosomes (Chromosome 2).
ร‚ยท Gene X is on Chromosome 1. Gene Y is on the short arm of Chromosome 2 and Gene Z is on the long arm of Chromosome 2.
ร‚ยท The maternal chromosomes have the X, y, z alleles, whereas the paternal chromosomes have the x, Y, Z alleles.
Draw these chromosomes, labeling ALL alleles, as they might appear in Metaphase I of Meiosis.

Question 3 (5 points)

Match the terms to the definitions provided.

Question 3 options:

telophase II

meiosis II

telophase I

anaphase I

anaphase II
1.

Division, beginning without DNA replication, that resembles and produces four haploid cell.s
2.

Phase of meiosis when chiasmata are broken as spindle fibers shorten and homologous pairs are pulled apart.
3.

Phase of meiosis when sister chromatids are pulled to opposite poles of the cells.
4.

Phase of meiosis in which homologues cluster at the poles of the cells and the nuclear envelope reforms.
5.

Phase of meiosis in which four different haploid cells are present.

Question 4 (7 points)

Match the terms to the definitions provided.

Question 4 options:

G0

telophase

G2

mitosis

cytokinesis

cell cycle

S
1.

The phase in which the cell synthesizes a replica of its genome
2.

The overall process of genome duplication
3.

The phase in the cell cycle during which mitochondria and other organelles replicate.
4.

The phase in mitosis when chromosomes are clustered at opposite poles and the spindle apparatus disappears
5.

A resting state that cells often enter before resuming cell division.
6.

The phase in the cell cycle when the cytoplasm divides creating two daughter cells.
7.

The phase in the cell cycle in which the spindle apparatus assembles and sister chromatids move apart.

Save

Question 5 (6 points)

Put the events of a MAP kinase cascade in the correct order.

Question 5 options:

MAPKKK phosphorylates and activates another kinase

MAPKK phosphorylates and activates MAPK

Binding of MAPKKK to Ras

External signal binds to membrane receptor and activates receptor kinase.

MAPK phosphorylates an inactive response protein and activates it.

Phosphorylation of receptor kinase and interaction with RAS

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