week1 - Chromosome: 1) 2) 3) 4) can be a single DNA...

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Chromosome: 1) can be a single DNA molecule- a single-chromatid chromosome (with the associated proteins) 2) a single-chromatid chromosome is represented by a single chain of beads 3) divided up into regions called genes -each gene determines a hereditary character. a. Allele - specific DNA nucleotide sequence present at a gene’s location or locus on the chromosome b. Different alleles can lead to different forms or traits of the character to produce different phenotypes 4) DNA replication occurs during the S sub phase of cell cycle prior to mitosis and meiosis a. Double-chromatid chromosomes - consisting of two identical DNA molecules b. Joined together by a centromere - a non-cooding region of DNA that binds sister chromatids together. c. Represented by two chains of beads, joined by a “centromere” bead pair. Ploidy: 1) Most eukaryotic species have their genes distributed on more than one type of chromosome. a. Humans (23), Sordoria fimicola (7), onion (6), lily (4) b. Ploidy state is the number of different chromosome types per cell c. Ploidy conditions- two common ones are i. Haploid (1n)- one copy of each chromosome type per cell, example-sperm cell, egg cell etc ii. Diploid (2n) - two copies of each chromosome type per cell. 2)
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week1 - Chromosome: 1) 2) 3) 4) can be a single DNA...

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