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Alex Gillam

on 20 April 2010

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Transcript of Inheritance

Inheritance Monohybrid Dihybrid Variation Mendel's Laws The study of inheritance of one characteristic Two copies of each gene (alleles) That segregate in the cells during meiosis Each gamete has ONE gene A heterozygous cross =3:1 ratio A test cross with a homozygote will check an organisms geneotype by looking at pheotype ratios that emerge The study of inheritance of two characteristics Linked Unlinked Give a 3:1 ratio in F2 - but when you look at them together it = 9:3:3:1 Recombinants arise due to the independent assortment of chormosomes Genes are tied together on the
same chromosome. They segregate together Recombinants can ONLY arise
by crossing over and swapping alleles
NOT by segregation There are many possible combinations There are limited possible combinations in the gametes Recombinants are organisms with genotypes
different from their parents. Assortment of chromosomes is more
predictable than recombination Crossing over is less predictable than
segregation of chromosomes into
Gametes It also occurs LESS frequently when linked genes are close together.
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