MRS. B’S FAMILY TREEDominant Recessive

And Punnett Square intro

Recap

What is a phenotype? What is a genotype?

Which allele is expressed? (What gene type overpowers the other?)

What happens when both a dominant and recessive allele are present?

What three combinations can yield 100 percent of the same phenotype?

Immediate family

2. My eye and hair genotypes are____ _____

3. Jason’s eye and hair genotypes____ _____

Both My brother Jason and I are recessive

Jason

MikeMrs. B

Mom

Dad

1. What are our phenotypes?

a) hairb) eyes

Mike is Dominant

4. What is his phenotype?

5. What could his phenotypes be?

Since my parents are Dominant and they had both Dominant and recessive offspring, what must their genotype be? a) hairb) eyes

Punnett Square

Mom (Bb) B b

Dad (Bb) B

b

What proportion of the offspring are recessive?

What proportion of the offspring are dominant?

Which generation in Mendel's pea plant experiments yielded the same proportions?

Grand-pop and Grand-mom

Grand-pop was blonde and had blue eyes.

1. What is the genotype for his a) hairb) eyes

Grand-mom has brown eyes and had brown hair. Both of her sons have brown hair and brown eyes.

2. What is Grand-mom’s genotype? a) hairb) eyes

Punnett Square

Grand-mom (BB)

Grand-pop (bb)

What proportion of the offspring are recessive?

What proportion of the offspring are dominant?

Which generation in Mendel's pea plant experiments yielded the same proportions?

Mom-mom and Pop-popMom-mom had Brown eyes and brown hair. 1. What could

her genotypes be?

a) hairb) eyes If I tell you that my mom and two of her brothers have brown eyes and brown hair, and her other one brother and sister have blue eyes and blonde hair,

2. What are Mom-mom’s genotypes? a) hairb) eyes

Pop-pop has blonde hair and blue eyes

3. What are his genotypes?a) hairb) eyes

Punnett Square

Mom-mom (Bb)

Pop-pop (bb)

What proportion of the offspring are recessive?

What proportion of the offspring are dominant?

Which generation in Mendel's pea plant experiments yielded the same proportions?

Jason and CarolynJason is recessive

1.What are his phenotypes a) hairb) eyes

and genotypesc) haird) eyes

Carolyn is heterogeneous Dominant

2. What are her phenotypes a) hairb) eyes

genotypesa) hairb) eyes

3. What can we use to determine possible offspring?

Punnett Square

Jason (bb) b b

Carolyn (Bb) B

b

What proportion of the offspring are dominant?

What proportion are recessive?

What do you think the phenotypes of their son Benjamin are?

Benjamin

Mike and Steph1. What are

their phenotypes?

a) hairb) eyes

2. What could their genotypes be?a) hairb) eyes

Eli

1. What are Eli’s

phenotypes a) hairb) eyes

2. Is Eli dominant or recessive?

3. What are his genotypesa) hairb) eyes

What do Mike and Steph’s genotypes have to be

Punnett Square

Mike

Steph

Eli

What proportion of the offspring are recessive?

What proportion of the offspring are dominant?

Which generation in Mendel's pea plant experiments yielded the same proportions?

When I have kids what color eyes must they have?

We both have___________ alleles.

Punnett Square

Mrs. B (bb)

Jim (bb)

What are the proportions my future offspring?

Phenotype?

Genotype?