-Complete the following sentences: metaphase of mitosis, prophase II of meiosis,
ID: 95149 • Letter: #
Question
-Complete the following sentences: metaphase of mitosis, prophase II of meiosis, crossing over, anaphase I of meiosis, variable, random fertilization, identical, random orientation, metaphase I of meiosis, prophase I of meiosis, metaphase II of meiosis, reduction division
Two processes that occur during meiosis produce genetically ____________ cells.
In a process called ____________ , paired homologous chromosomes align randomly at the cell equator. This occurs during this stage of cell division: ____________ .
In a process called ____________ , genetic material is exchanged between homologous chromosomes. This occurs during this stage of cell division: ____________ .
-Complete the following paragraph to describe nondisjunction and the resulting effects on chromosome number.
words: euploidy, primary nondisjunction, nomal, nondisjunction, secondary nondisjunction, homologous chromosomes, abnormal, trisomy, monosomy, sister chromatids, aneuploid
1.During meiosis I, ____________ separate and move towards opposite ends of the poles.
2.During meiosis II, ____________ separate and move towards opposite ends of the poles.
3.During meiosis I, if both members of a homologous pair go into the same daughter cell, ____________ is said to occur and no normal gametes are produced.
4.During meiosis II, if the sister chromatids fail to separate and both daughter chromosomes go into the same gamete, ____________ is said to occur. Half the gametes are aneuploid while the other half are euploid.
5.If an egg that contains 24 chromosomes instead of 23 chromosomes is fertilized by a normal sperm, ____________ is said to have occurred.
6.If an egg that contains 22 chromosomes instead of 23 chromosomes is fertilized by a normal sperm, ____________ is said to have occurred.
Explanation / Answer
Two processes that occur during meiosis produces genetically variable cells.
In a process called random orientation, paired homologous chromosomes align randomly at the cell equator. This occurs during this stage of cell division: metaphase I of meiosis
In a process called crossing over, genetic material is exchanged between homologous chromosomes. This occurs during this stage of cell division: anaphase I of meiosis
During meiosis I, homologous chromosomes seperate and move towards opposite poles.
During meiosis II, sister chromatids chromosomes separate and move towards opposite poles
During meiosis I, if both the members of the homologous chromosomes go into the daughter cell, nondisjunction is said to occur and no normal gametes are produced.
During meiosis II, if both sister chromatids fail to separate and both daughter chromosomes go into the same gamete, aneuploid is said to occur. Half the gametes are aneuploid while the other half are euploid.
If an egg that contains 24 chromosomes instead of 23 chromosomes is fertilized by a normal sperm, trisomy is said to have occurred.
If an egg that contains 22 chromosomes instead of 23 chromosomes is fertilized by a normal sperm, monosomy is said to have occurred.
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