Lesson 18 using punnett squares and pedigrees
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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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Lesson 18 Using Punnett Squares and Pedigrees

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Lesson 18 using punnett squares and pedigrees

B

b

B

b

Lesson 18 Using Punnett Squares and Pedigrees

Bb x Bb

male / sperm

X

BB

Bb

Remember this?

female / eggs

Bb

bb


Lesson 18 using punnett squares and pedigrees

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.


Lesson 18 using punnett squares and pedigrees

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


Lesson 18 using punnett squares and pedigrees

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

__

?

__


Lesson 18 using punnett squares and pedigrees

__

__

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 _____%.

___%


Lesson 18 using punnett squares and pedigrees

Who you are…

_________________

___Chromosomes


Lesson 18 using punnett squares and pedigrees

___________ = 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.


Lesson 18 using punnett squares and pedigrees

Reading a Pedigree

= 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


Lesson 18 using punnett squares and pedigrees

Another view of a pedigree…

This one is for Huntington’s Disease


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