CAS BI 107 Study Guide - Quiz Guide: Intellectual Disability, Sister Chromatids, Leukemia
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23 May 2017
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Biology notes: chromosomes, meiosis and the production of sex cells. Exclusively for reproduction purposes and occurs only once. Occurs only in reproductive tissue germinal epithelial cells of gonads- testes/ ovaries of animals and anthers/ ovaries of plants. Give rise to sex cells called gametes. Allows important process of reduction in number of chromosomes to prevent doubling up effect of fertilization. Therefore 46 chromosomes are halved to 23- when the gametes fuse 23+23= 46. This chromosomal reduction happens before sexual reproduction. Dna molecules only form an x once they have replicated. When chromosomes are halved, they are haploid. When chromosomes are doubled they are diploid. Therefore egg and sperm are haploid and when they fuse to a zygote they are diploid. In a person"s karyotype, each pair has a paternal chromatid and a maternal chromatid. The daughter cells that come out of meiosis must have one chromosome from each pair of chromosomes of the 46.
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1.
Which of the following statements is NOT TRUE about chromosomes?
Prokaryotes have a singel, circular chromosome | ||||||||||||||||||||||||||||||||||||||
Eukaryotes have multiple, linear chromosomes. | ||||||||||||||||||||||||||||||||||||||
Human cells normally 23 pairs of chromosomes. | ||||||||||||||||||||||||||||||||||||||
Eukaryote chromosomes are composed of only DNA 2. Which of the following is NOT TRUE about reproduction?
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