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Blood Type Inheritance and the Punnett Square. Blood Type Inheritance. Type O blood = oo (recessive) Type B blood = BB (homozygous) or Bo (heterozygous) Type A blood = AA (homozygous) or Ao (heterozygous) Type AB blood = AB. Terms to be familiar with.

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Presentation Transcript
blood type inheritance
Blood Type Inheritance
  • Type O blood = oo (recessive)
  • Type B blood = BB (homozygous)

or

Bo (heterozygous)

  • Type A blood = AA (homozygous)

or

Ao (heterozygous)

  • Type AB blood = AB
terms to be familiar with
Terms to be familiar with
  • Homozygous = same letters (alleles)
  • Heterozygous = different letters (alleles)
  • Genotype = letters (inherit 1 from each parent)
  • Phenotype = physical appearance of trait (actual blood type)
  • Dominant = shows up; covers up recessive trait
  • Recessive = trait that can be masked
punnett square1
Punnett Square

One parent’s genotype goes here

The other parent goes here

punnett square2
Punnett Square

One parent’s genotype goes here

The other parent goes here

punnett square3
Punnett Square

One parent’s genotype goes here

The other parent goes here

example
Example

Jack and Jill get married and have a child. Jack is heterozygous for the blood Type A and Jill has type AB blood. What is the chance that they will have a baby with type B blood?

slide11

Based on the Punnett Square, there is a 50% the child will type A blood, 25% the child will have type AB blood, and a 25% the child will have B blood.

A o

A

B

example1
Example

Jack and Jill get married and have a child. Jack is heterozygous for the blood Type A and Jill has type AB blood. What is the chance that they will have a baby with type B blood?

Based on the results on the previous slide, there is a 25% chance a child of Jack and Jill’s will have type B blood.

example 2
Example 2

Bonnie and Clyde are having a baby and they want to know if there is a chance that they can have a child with Type O blood. Bonnie is homozygous for type A blood and Clyde has type O blood. What did you find out?

they will not have a child with type o blood there children will only have type a blood 100 chance
They will not have a child with Type O blood. There children will only have type A blood (100% chance).

o o

A

A