ENVS 010 Lecture Notes - Lecture 9: Asexual Reproduction, Sexual Reproduction, Cell Division

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tealsheep170

29 Apr 2019

School

SJSU

Department

Environmental Studies, Department of

Course

ENVS 010

Professor

Laizzer

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Document Summary

Carries thousands genes that contain all genetic info. We usually have them in homologous chromosomes. When they"re duplicated, they turn into the x shape. Each gamete has only one chromosome set (in humans, 23 chromosomes) Haploid sperm cell fuses with a haploid egg cell. Now has a full set of 46 chromosomes, mom has 23, dad has 23. Fertilized egg becomes a zygote and is now a diploid. Cell cycle: cells go into interface where the cells duplicate then go into mi--- and they split. Cell division into two cells and it goes through that process again. Ex. skin makes new skin when you cut yourself. Ex. going to the gym to get more muscles. The process happens twice that"s why there"s 4 daughter cells in the end instead of 2 like in mitosis. Translation: change of rna info to a protein. Studied inheritance in peas with one difference the flower color.

Related Questions

-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.

ENVS 010 Lecture Notes - Lecture 9: Asexual Reproduction, Sexual Reproduction, Cell Division

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