Celebrity Genetics
Use the table below and the Punnett square reading on pg. 35 to answer the following celebrity
genetics scenarios.
1.
2.
3.
Dominant trait
Dark hair (brown or black)
Widow’s peak
Dark eyes (brown or black)
Allele
B
D
A
Freckles
G
Recessive trait
Light hair (red or blond)
Straight hair
Light eyes (blue, hazel,
green, or violet)
No freckles
Allele
b
d
a
g
Selena Gomez is homozygous for dark hair, and Justin Bieber is homozygous for blond hair.
a.
Selena’s genotype ___
b.
Justin’s genotype ___
c.
Fill out the Punnett square to the right for Justin and Selena’s offspring.
d.
What is the only possible genotype for their offspring? ____
e.
What is the percentage chance that their child inherits Justin’s blond hair? ____
Macklemore has one dominant allele for freckles and one recessive allele for freckles. Nicki Minaj has no freckles.
a.
Macklemore’s phenotype _______________
b.
Nicki’s phenotype _______________
c.
Fill out the Punnett square to the right for Macklemore and Nicki’s offspring.
d.
What are the 2 possible genotypes for their offspring? ____ & ____
e.
If they have 8 children, how many of them will probably have no freckles like Mom? ____
In a cross between homozygous green-eyed Taylor Swift and homozygous green-eyed Harry Styles, they have a child.
a.
Taylor’s genotype ___ Taylor’s phenotype ___________________
b.
Harry’s genotype ___ Harry’s phenotype ___________________
c.
Fill out the Punnett square to the right for Harry and Taylor’s offspring.
d.
What is the percentage chance their child will have dark eyes? ______
e.
What is the percentage chance their child will have light eyes? ______
4.
5.
Kanye West is homozygous dominant for hair color. Kim Kardashian is heterozygous for hair color.
a.
Kanye’s genotype ____
Kanye’s phenotype ____________________
b.
Kim’s genotype ____
Kim’s phenotype ____________________
c.
Fill out the Punnett square to the right for Kim and Kanye’s offspring.
d.
On the Punnett square, circle the genotype that would give Kim and Kanye the
greatest chance of having blond grandchildren.
e.
If Kim and Kanye had 12 children, how many of their children would be heterozygous for hair color? ____
For the widow’s peak gene, Leonardo DiCaprio has one of each kind of allele. Which female celebrity should Leonardo
date to give him the greatest chance of NOT passing on his widow’s peak allele to his children?
Female celebrity
Kourtney Kardashian
Blake Lively
Tyra Banks
Genotype
DD
Dd
dd
Phenotype
Widow’s peak
Widow’s peak
Straight hairline
Leo & Kourtney
Leo & Blake
Leo & Tyra
DD = ____%
Widow’s peak = ____%
DD = ____%
Widow’s peak = ____%
DD = ____%
Widow’s peak = ____%
Dd = ____%
Straight hairline = ____%
Dd = ____%
Straight hairline = ____%
Dd = ____%
Straight hairline = ____%
dd =____%
dd =____%
dd =____%
If Leonardo doesn’t want to pass on his widow’s peak to his children, he should date _____________________________________.
6.
Write the possible genotypes for each description:
a.
Homozygous _____
_____
d. Homozygous dominant _____
b.
Heterozygous _____
e. Homozygous recessive _____
c.
Hybrid _____
f. Purebred/True-breeding ____
g. Showing the dominant trait
_____ _____