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Dihybrid Cross Notes

Dihybrid Cross Notes. 1. Determine dominant and recessive traits Carefully read the problem

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Page 1: Dihybrid Cross Notes. 1. Determine dominant and recessive traits Carefully read the problem

Dihybrid Cross Notes

Page 2: Dihybrid Cross Notes. 1. Determine dominant and recessive traits Carefully read the problem

1. Determine dominant and recessive traits

Carefully read the problem

Page 3: Dihybrid Cross Notes. 1. Determine dominant and recessive traits Carefully read the problem

2. Assign letters for the trait

B = black

b = white

H = Hairy

h = no hair

Page 4: Dihybrid Cross Notes. 1. Determine dominant and recessive traits Carefully read the problem

3. Determine genotype for parents

*Parents must have 4 alleles

Heterozygous, black, hairless male = Bbhh

White heterozygous hairy female = bbHh

Page 5: Dihybrid Cross Notes. 1. Determine dominant and recessive traits Carefully read the problem

4. Draw the punnett square with 16 boxes

Page 6: Dihybrid Cross Notes. 1. Determine dominant and recessive traits Carefully read the problem

5. Put parent gamete combinations on box

Bbhh gametes:

Bh, Bh, bh, bh

bbHh gametes:

bH, bh, bH, bh

Bh Bh bh bh

bH

bh

bH

bh

BbHh BbHh bbHh bbHh

Bbhh Bbhh bbhh bbhh

BbHh BbHh bbHh bbHh

Bbhh Bbhh bbhh bbhh

Page 7: Dihybrid Cross Notes. 1. Determine dominant and recessive traits Carefully read the problem

Extra tips

• When determining the probability of events– If the problem states “and” then multiply the

chances for each• Chance of heads and heads = ½ x ½ = ¼ or 25%

– If the problem states “or” then add the chances for each

• Chance of heads or tails = ½ + ½ = 1 or 100%

As you work the problems write in your own extra tips

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