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Symbols to Know for Crosses

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Symbols to Know for Crosses - PowerPoint PPT Presentation


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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

  • 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
mapping 1 making the double mutant
Mapping 1: Making the double mutant

hermaphrodite

self cross

X

gametes

Progeny genotype

Progeny phenotypes

and ratios

What if the genotype of the parent was + unc/+ unc?

mapping 2 making heterozygotes for mapping
Mapping 2: Making heterozygotes for mapping

Hermaphrodite

Parent genotype

Male Parent

genotype

X

Female gametes

Male gametes

Progeny genotype

Progeny phenotypes

and ratios

Why might you see Dpy Unc progeny?

mapping 3 test cross
Mapping 3: Test Cross

Hermaphrodite

Parent genotype

Male Parent

genotype

X

Parental

Recombinant

Female gametes

Male gametes

Progeny genotype

Progeny phenotypes

and ratios

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