FA2011lecture2

FA2011lecture2 - determinants segregate independently of...

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What was so special about what Mendel did? • Performed controlled, reciprocal crosses • Analyzed characters showing only two different forms (e.g. seed shape round or wrinkled, seed color yellow or green) • Worked with true-breeding lines (“pure lines”) • Fortuitously, each difference analyzed was controlled by a single gene • Analyzed large numbers of progeny in a rigorous, quantitative way
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Mendel’s Law of Segregation: When gametes are formed, the paired hereditary determinants segregate so that each gamete receives only one; these determinants are re-united in random combinations (one from each parent) at fertilization. Law of independent assortment : during gamete formation, different pairs of hereditary
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Unformatted text preview: determinants segregate independently of each other (if the corresponding genes are unlinked!) Defnitions Phenotype : what it looks like Genotype : the genetic constitution (e.g. Rr or rr) Alleles : alternative versions of a gene - in diploids, there are two alleles of every gene, which reside on a pair of Homologous chromosomes : closely related chromosomes containing all the same genes, one inherited from male parent and one from female Homozygous : having identical alleles for a given gene (e.g. RR or rr) (true-breeding lines homozygous!!) Heterozygous : having different alleles for a given gene (e.g. Rr)...
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FA2011lecture2 - determinants segregate independently of...

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