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27 Feb 2019

You count a total of eight chromosomes in an animal cell at metaphase I in meiosis. (1pt)a) What is this organismâs diploid number?b) How many pairs of homologous chromosomes are there?c) How many sister chromatids?d) Would you expect to see the same or different numbers of sister chromatids in a mitotic metaphase cell from the same organism?

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Beverley SmithLv2

28 Feb 2019

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Meerkats are a diploid organisms with n=18.

For each of the following, indicate the total number of chromosomes, the number of pairs of homologous chromosomes and the number of pairs of sister chromatids. Indicate if the cell in question is diploid or haploid and if the daughter cell will be diploid or haploid.

A. A non-dividing skin cell

Total number of chromosomes:

Number of pairs of homologous chromosomes:

Number of pairs of sister chromatids:

Diploid or haploid?

B. A cell is prophase of meiosis I:

Total number of chromosomes:

Number of pairs of homologous chromosomes:

Number of pairs of sister chromatids:

Diploid or haploid?

Daughter cell diploid or haploid?

C. Cell in metaphase meiosis II:

Total number of chromosomes:

Number of pairs of homologous chromosomes:

Number of pairs of sister chromatids:

Diploid or haploid?

Daughter cell diploid or haploid?

D. A mature sperm cell:

Total number of chromosomes:

Number of pairs of homologous chromosomes:

Number of pairs of sister chromatids:

Diploid or haploid?

salmongerbil352

The following questions refer to a diploid organism with seven pairs of chromosomes. FOR MOLECULAR GENETICS. PLEASE ANSWER BOTH QUESTIONS AND EXPLAIN***

1. How many sister chromatids would you expect to find in a skin cell during mitotic metaphase? would it be 14 or 28? or is it wrong?

2. How many chromosomes would you expect to see in a sperm cell from this organism? would it be 7 or 14? or is it worng?

erinyak297

Consider each of the following statements.

In meiosis, the chromosomal material doubles during the lastpremeiotic interphase.

The greater the number of chromosome pairs, the greater is theeffect of meiosis in producing genetically distinct gametes.

The diploid number of chromosomes is half the haploidnumber.

A cell that will not divide again remains in the GÂ2 stage ofinterphase.

The correct sequence of events during meiosis is: synapsis ?dyad formation ? chiasma formation

In an organism with n = 3, there is a 1 in 8 probability of agamete with all maternally derived chromosomes contributing to theproduction of a zygote.

An organism with n = 3 can produce 8 different kinds of gametesin relation to combinations of maternal and paternalchromosomes.

Separation of sister chromatids occurs during anaphase I ofmeiosis and is the physical basis for the law of independentassortment.

A single diploid cell that undergoes meiosis in the male testiswill produce 4 genetically different gametes if crossing-over isignored.

The independent alignment of different tetrads at metaphase I ofmeiosis is the physical basis of the law of independentassortment.

If a diploid cell has 20 pairs of chromosomes, there will be 10tetrads during prophase I of meiosis.

If a diploid cell has 20 pairs of chromosomes, there will be 20bivalents during prophase I of meiosis.

If a diploid cell has 20 pairs of chromosomes, there will be 80chromatids present during metaphase of mitosis.

If a diploid cell has 20 pairs of chromosmes, the organism canmake 20² types of gametes if crossing-over isignored.

Segregation of sister chromatids occurs during anaphase I ofmeiosis and is the physical basis of the law of segregation.

For an individual with a diploid number of 30 chromosomes, therewill be 60 chromatids at metaphase I of meiosis.

For an individual with a diploid number of 30 chromosomes, therewill be 15 tetrads at metaphase II of meiosis.

yellowpig507

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