Unformatted text preview: MEIOSIS terms NOVEMBER, 2007 Sugrue A chromatid contains one double-stranded DNA molecule. subsequent to S, each chromosome has two (identical) parts called chromatids (sister chromatids), which are connected at a section of the chromosome called a centromere . The DNA molecules in sister chromatids are identical because they are the two products of a single semi-conservative DNA replication. How many chromatids per chromosome? Before S, each chromosome has one chromatid (containing one double-stranded DNA molecule); after S each chromosome has 2 chromatids (each containing one double-stranded DNA molecule). " N " -- Number of different types of chromosomes is called N. For humans, N = 23. Ploidy = number of chromosomes of each type. Homologs Definition: All the chromosomes of each type = all chromosomes of same size, banding pattern, & position of centromere (shape) = homologs. Number: There are 2 homologs = 2 of each type of chromosome in diploid cells. One from mom, one centromere (shape) = homologs....
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This note was uploaded on 01/04/2012 for the course ANT 610C taught by Professor Johnaris during the Spring '10 term at University of Florida.
- Spring '10