BIOL 1090 Lecture Notes - Lecture 3: Zygosity, Centromere, Hugo De Vries
3 Nov 2017
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Document Summary
Sister chromatids are the product of dna replication; therefore an allele on one sister chromatid will always match the other. During the old (part of the mother genome) histones are segregated to one strand of dna; to the maternal centrosome. In prophase an enzyme phosphorylates the histone h3. Experiment 1: p tall x dwarf, f1 tall x tall, f2 787 tall and 277 dwarf 3:1 ratio*** ratio was consistant for other traits, 4 possible genotypes amongst f2. Locus/loci: centromere also considered a locus not important. In a heterozygote one alleles may hide the presence of another; dominant over others. Neither allele is changed by coexisting with the other in a heterozygote. A dyhbrid cross: two traits inherited independently: f1 makes 4 phenotypes equally, f2 makes a 9:3:3:1 ratio, 4 phenotypic classes in f2 generation.
