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Symbols to Know for Crosses

Symbols to Know for Crosses

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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. Female Parent genotype Male Parent genotype X Complementation – Cross 1 making the heterozygous males Female gametes Male gametes Progeny genotype Progeny phenotypes and ratios

  3. Female Parent genotype Male Parent genotype X Complementation – mutations in different dpy genes Female gametes Male gametes Progeny genotype Progeny phenotypes and ratios WHY might there be some Dpy hermaphrodites?

  4. Female Parent genotype Male Parent genotype X Complementation – mutations in the same dpy gene Female gametes Male gametes Progeny genotype Progeny phenotypes and ratios Why are we looking for Dpy males when the mutations are in the same gene?