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Dihybrid Crosses. Why Dihybrid ?. Sometimes there are traits in the genotype that are linked The traits that have two genes require a special punnett square. Why Dihybrid?. When there are two genes we use a dihybrid cross

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Presentation Transcript
why dihybrid
Why Dihybrid?
  • Sometimes there are traits in the genotype that are linked
  • The traits that have two genes require a special punnett square
why dihybrid1
Why Dihybrid?
  • When there are two genes we use a dihybrid cross
  • A dihybrid cross is a special type of punnett square that lists all the genotypes from two linked genes
how to set it up
How To Set It Up
  • In order to set up the dihybrid cross we need to figure out all of the possible genotypes
  • Remember there are two genes
  • We can have a dominant or recessive for each gene in the linked genes
how to set it up1
How To Set It Up
  • The hardest part of setting up your Dihybrid is setting up the alleles
  • Each parent is giving a pair of linked genes
  • That means they will be giving one (A or a) and one (B or b)
  • We need to account for all of the possibilities for gene (A or a) and gene (B or b)

AABB x aabb

how to set it up2
How To Set It Up

AaBb

  • Once you have all of the genotypes, you would list the father and the mother
  • In order to make it easy, think about solving a “FOIL” method problem

AaBb

solving the cross
Solving the Cross
  • Now all we do is solve
  • Each box should have a column and a row
  • Each square should have two different alleles for each genotype
practice
Practice
  • AABB homozygous gene is crossed with aabb homozygous recessive
  • What are the genetic outcomes
practice1
Practice
  • AaBb heterozygous gene is crossed with a aabb homozygous recessive gene
  • What are the possible genetic outcomes
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