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Symbols to Know for Crosses

Symbols to Know for Crosses. a/a – a is the allele and / represents the two chromatids – there are two alleles for a diploid organism a b/a b – two different genes on the same chromosome a/a ; b/b – two different genes on different chromosomes ; designated separate chromosomes

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Symbols to Know for Crosses

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  1. Symbols to Know for Crosses • a/a – a is the allele and / represents the two chromatids – there are two alleles for a diploid organism • a b/a b – two different genes on the same chromosome • a/a ; b/b – two different genes on different chromosomes ; designated separate chromosomes • X – symbolizes mating between two different individuals • X - symbolizes a self cross – when the hermaphrodite worms fertilize their own eggs • + is the wild type or non-mutant form of a gene

  2. dpy/dpy; unc/unc Hermaphrodite Parent genotype Male Parent genotype +/+ ; +/+ X Series 1: Autosomal Unlinked Hermaphrodite gametes Male gametes F1 Progeny genotypes F1 Progeny phenotypes and ratios Which progeny are you continuing with? Why?

  3. Series 1: Autosomal Unlinked F1 parent self cross X F1 gametes students can show Punnet Square F2 Progeny genotype F2 Progeny phenotypes and ratios

  4. Hermaphrodite Parent genotype dpy unc/dpy unc Male Parent genotype + + / + + X Series 1: Autosomal Linked Hermaphrodite gametes Male gametes F1 Progeny genotype F1 Progeny phenotypes and ratios Which progeny are you continuing with? Why?

  5. F1 parent self cross X F1 gametes F2 Progeny genotype F2 Progeny phenotypes and ratios

  6. gene-1/gene1; x-gene2/x-gene2 +/+ ; +/0 Male Parent genotype X Hermaphrodite Parent genotype Series 1: One Autosomal, One x-linked Hermaphrodite gametes Male gametes F1 Progeny genotype F1 Progeny phenotypes and ratios With which progeny are you continuing? Why?

  7. Series 1: One Autosomal, One x-linked F1 parent self cross X F1 gametes F2 Progeny genotypes F2 Progeny phenotypes and ratios

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