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# Lesson 18 Using Punnett Squares and Pedigrees - PowerPoint PPT Presentation

B. b. B. b. Lesson 18 Using Punnett Squares and Pedigrees. Bb x Bb. male / sperm. X. BB. B b. Remember this?. female / eggs. B b. bb. A Punnett Square is a diagram used to identify _____________ combinations resulting from a mating.

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b

B

b

Lesson 18 Using Punnett Squares and Pedigrees

Bb x Bb

male / sperm

X

BB

Bb

Remember this?

female / eggs

Bb

bb

A Punnett Square is a diagram used to identify _____________ combinations resulting from a mating.

This married couple is considering having their first baby.

The man is heterozygous for a disease. The woman is also heterozygous for the disease.

The couple comes to you for counseling. They want you to tell them are the chances they will have a healthy baby.

You know that the disease they carry is a recessive trait and that both parents are heterozygous.

RR

Rr

rr

Which of the above genotypes will you need to use?

__

__

Man x Woman

__

?

__

__ and that both parents are heterozygous.

__

Man x Woman

____

____

__

Genotype %

RR =

Rr =

rr =

___%

___%

__

___%

Phenotype %

Healthy =

Carrier =

Diseased =

___%

___%

The chance that the couple will have a baby that has the disease is _____%.

___%

Who you are… and that both parents are heterozygous.

_________________

___Chromosomes

___________ and that both parents are heterozygous.= family record for one specific trait.

__________________ traits = genes for these traits are carried on the sex chromosomes.

The gene for Red-Green _______ _______________is carried on the ___chromosome.

Female must get ___(___) X’s to have colorblindness.

Why are most sex-linked traits carried on the X chromosome?

Male must get ___(__Y) X to have colorblindness.

Reading a Pedigree and that both parents are heterozygous.

= female without trait

= male without trait

= female with trait

= male with trait

= male carrier

= female carrier

= two parents

= three children

Analyzing a Pedigree Interactive

http://highered.mcgraw-hill.com/sites/0072485949/student_view0/chapter3/interactive_activity.html

Another view of a pedigree… and that both parents are heterozygous.

This one is for Huntington’s Disease