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Lecture

BIO260 Tutorial One.docx

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Department
Biology
Course
BIO260H1
Professor
Shelley Lumba
Semester
Winter

Description
BIO260 Tutorial One Loci = location of gene on a chromosome Homologous Chromosomes = members of the same diploid chromosome pair (can be aa or AA or Aa doesn’t matter) Heterozygous Chromosomes = two chromosomes with two different alleles (Aa) Homozygous Chromosomes = same alleles on both chromosomes in a pair (aa or AA) Sister Chromatids = appear during replication, when a chromosome replicates itself and as a result you end up with two chromosomes that are identical (must be homozygous) 2n: simply implies that the chromosomes we are talking about exist in diploid pairs n: number of centromeres Centromeres = that pinch in the middle that holds two sister chromatids together C = absolute number of chromosomes (DNA content) During meiosis cells undergo two different kinds of division Reductional and Equational division. At metaphase I the homologous chromosomes separate and replicate doubling the value of C while the value of n remains the same. Then the cell undergoes reductional division, it is called reductional d
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