4 boxes is what I have, the directions say a monohybrid cross between an animal with the genotype Bb and an animal with the genotype bb. Black color (B0 is dominant brown color (b) and it wants to know the percentage of the offspring would you expect to be black in color
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Along the top of the square, you have two boxes.
Above the left one write B and the above the right one write b.
this represents the two alleles form the genotype Bb
Down the left side of the punnett square, there are two boxes and each will be labeled
bb. this side will represent the alleles from the bb genotype
now on the inside of each square write the combination that occurs when the alleles join.
I write it out with the top allele being first and the side allele being second
You should find that the left side of your punnett square is Bb, both the top and bottom row
and the right side is bb, both the top and bottom row.
IOut of the four squares, only 2 have a Bb genotype. so 2 out of 4 offspring or 50% will be be black
Above the left one write B and the above the right one write b.
this represents the two alleles form the genotype Bb
Down the left side of the punnett square, there are two boxes and each will be labeled
bb. this side will represent the alleles from the bb genotype
now on the inside of each square write the combination that occurs when the alleles join.
I write it out with the top allele being first and the side allele being second
You should find that the left side of your punnett square is Bb, both the top and bottom row
and the right side is bb, both the top and bottom row.
IOut of the four squares, only 2 have a Bb genotype. so 2 out of 4 offspring or 50% will be be black