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In 1882, Pierre-Joseph van Beneden, was surprised to find the same number of chromosomes in all cells of the roundworm Ascaris. A) True B) False
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A ________ cell contains two versions of each chromosome.
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Meiosis:-

Meiosis - CSCC

QuestionAnswer
In 1882, Pierre-Joseph van Beneden, was surprised to find the same number of chromosomes in all cells of the roundworm Ascaris. A) True B) False False
A ________ cell contains two versions of each chromosome. diploid
An organism reproduces either sexually or asexually but not both.A) True B) False False
In the sexual life cycle, there is an alternation of diploid and haploid phases. A) True B) False True
_____________ cells are genetically identical to the zygote from which they originated. A) Somatic B) Germ-line C) Body D) All of the above D) All of the above
In animals, the completion of meiosis is followed soon by fertilization
Before the beginning of either meiosis or mitosis, the chromosomes have replicated during Interphase
During ___________, the homologous chromosomes line up side by side, physically touching one another at which point crossing over is initiated. prophase I
During ____________, the random orientation of the chromosomes results in a shuffling of the chromosomes so that each daughter cell that results has a different combination of parental chromosomes. metaphase I
Meiosis II is simply a mitotic division involving the products of meiosis I, except that the sister chromatids are not genetically identical as they are in mitosis. A) True B) False true
At the end of meiosis II, each of the haploid cells contains ________ of every chromosome in the set. one
__________________ draws homologous chromosomes together all along their lengths creating an opportunity where two homologues can physically exchange portions of themselves. Synapsis
Reduction division produces diploid gametes thus ensuring that the chromosome number remains the same as the parents, following fertilization. A) True B) False False
Both mitosis and meiosis start with a diploid cell but the end result is haploid cells in meiosis and diploid cells in mitosis. A) True B) False True
In most respects, ____________ is identical to a normal mitotic division the second meiotic division
Sexual reproduction increases genetic variability through A) independent assortment B) crossing over C) random fertilization D) all of the above D) all of the above
In humans there are more than 8 million different possible kinds of gametes that can be produced. A) True B) False True
Reproduction that involves the alternation of meiosis and fertilization is called asexual reproduction. A) True B) False False
Organisms that reproduce by mitotic division are practicing sexual reproduction. A) True B) False False
An egg and a sperm unite to form a new organism. In order to prevent the new organism from having twice as many chromosomes as its parents germ cells went through meiosis; the egg and sperm only have half the parental chromosomes.
The diploid number of chromosomes in humans is 46. The haploid number is 23
In organisms that have sexual life cycles there is a time when there are 1n gametes (haploid), followed by 2n zygotes (diploid).
The purpose of meiosis I is to randomly separate the homologous pairs, called independent assortment.
The purpose of meiosis II is to separate the duplicated sister chromatids.
During which stage of meiosis does crossing over occur? prophase I
Synapsis is the process whereby homologous chromosomes become closely associated.
The purpose of mitosis is to ____, while the purpose of meiosis is to _____. make diploid cells/make haploid cells
A major consequence of sex and meiosis is that each species has a lot of genetic reassortment due to what can happen in meiosis I.
Genetic diversity is greatest in sexual reproduction
The main outcome of the four stages of meiosis II---prophase II, metaphase II, anaphase II, and telophase II-is to separate sister chromatids
Created by: Bonnie870
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