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13 Sep 2018

25.

Which of the following would you most likely expect to find only normal human males?

One Y chromosome

Two X chromosomes

Two X and two Y chromosomes

Two Y chromosomes

26.

The chromosome 1 that you inherited from your father and the chromosome 1 that you inherited from your mother are considered _____.

nonhomologous chromosomes

sister chromatids

homologous chromosomes

centrometeres

27.

After DNA replication, the two copies of DNA that are attached to the same chromosome are called______.

homologous chromosomes

sister chromatids

telomeres

inversions

28.

The genetic exchange of genetic material between chromosomes normally occurs during ______.

Telophase II of meiosis

Metaphase of mitosis

Prophase I of meiosis

Cytokinesis

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Beverley Smith
Beverley SmithLv2
15 Sep 2018
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Related questions

Match the term with its correct definition or explanation.

Chromatin

Homologous Chromosomes

Sister chromatids

Diploid

Interphase

S Phase

Synapsis

Crossing Over

Cell Plate

Cleavage Furrow

A. The exchange of genetic material between homologous chromosomes during meiosis I.

B. The pairing or tight association of homologous chromosomes in meiosis I. Results in the formation of a tetrad.

C. Non-identical copies of the same chromosome. Present in all diploid cells, even before replication. These chromosomes are the same length and contain genes for the same characteristics, but may have different alleles for each gene. D.

The period of the cell cycle that includes G1, S phase, and G2. E. A structure that develops during cytokinesis in plants.

F. Condensed chromosomes.

G. An invagination that develops during cytokinesis in animal cells.

H. When an organism has two copies of every chromosome (2n).

I. Two identical copies of a chromosome. These are only present after DNA replication.

J. The phase of the cell cycle when DNA is replicated.

If the diploid chromosome number is 12, each cell has as 6 x 10 -6 grms of DNA, how many chromosomes, chromatids and DNA would you find in the following stages of cell division of a cell. (Assume cytokinesis after anaphase)

Stage of Cell Division

# of Chromosomes

# of chromatids

Amount of DNA

Prophase of mitosis

Prophase of meiosis I

Metaphase of mitosis

Anaphase of mitosis

Metaphase of meiosis I

Anaphase of meiosis I

Telophase of mitosis

Telophase of meiosis I

Metaphase of meiosis II

Telophase of meiosis II

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.

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