Dominant trait Allele Recessive trait



Download 46.49 Kb.
Date16.07.2018
Size46.49 Kb.

Dominant trait

Allele

Recessive trait

Allele

Dark hair (brown or black)

B

Light hair (red or blond)

b

Widow’s peak

D

Straight hair

d

Dark eyes (brown or black)

A

Light eyes (blue, hazel, green, or violet)

a

Freckles

G

No freckles

g
Celebrity Genetics

Use the table below and the Punnett square reading on pg. 35 to answer the following celebrity genetics scenarios.




  1. Selena Gomez is homozygous for dark hair, and Justin Bieber is homozygous for blond hair.



  1. Selena’s genotype ___



  1. Justin’s genotype ___



  1. Fill out the Punnett square to the right for Justin and Selena’s offspring.



  1. What is the only possible genotype for their offspring? ____



  1. What is the percentage chance that their child inherits Justin’s blond hair? ____



  1. Macklemore has one dominant allele for freckles and one recessive allele for freckles. Nicki Minaj has no freckles.



  1. Macklemore’s phenotype _______________



  1. Nicki’s phenotype _______________



  1. Fill out the Punnett square to the right for Macklemore and Nicki’s offspring.



  1. What are the 2 possible genotypes for their offspring? ____ & ____



  1. If they have 8 children, how many of them will probably have no freckles like Mom? ____



  1. In a cross between homozygous green-eyed Taylor Swift and homozygous green-eyed Harry Styles, they have a child.



  1. Taylor’s genotype ___ Taylor’s phenotype ___________________



  1. Harry’s genotype ___ Harry’s phenotype ___________________



  1. Fill out the Punnett square to the right for Harry and Taylor’s offspring.



  1. What is the percentage chance their child will have dark eyes? ______



  1. What is the percentage chance their child will have light eyes? ______

  1. Kanye West is homozygous dominant for hair color. Kim Kardashian is heterozygous for hair color.



  1. Kanye’s genotype ____ Kanye’s phenotype ____________________



  1. Kim’s genotype ____ Kim’s phenotype ____________________



  1. Fill out the Punnett square to the right for Kim and Kanye’s offspring.



  1. On the Punnett square, circle the genotype that would give Kim and Kanye the greatest chance of having blond grandchildren.



  1. If Kim and Kanye had 12 children, how many of their children would be heterozygous for hair color? ____



  1. 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

Genotype

Phenotype

Kourtney Kardashian

DD

Widow’s peak

Blake Lively

Dd

Widow’s peak

Tyra Banks

dd

Straight hairline




Leo & Kourtney Leo & Blake Leo & Tyra


DD = ____% Widow’s peak = ____%

Dd = ____% Straight hairline = ____%

dd =____%

DD = ____% Widow’s peak = ____%

Dd = ____% Straight hairline = ____%

dd =____%

DD = ____% Widow’s peak = ____%

Dd = ____% Straight hairline = ____%

dd =____%

If Leonardo doesn’t want to pass on his widow’s peak to his children, he should date _____________________________________.



  1. Write the possible genotypes for each description:



  1. Homozygous _____ _____ d. Homozygous dominant _____ g. Showing the dominant trait

_____ _____

  1. Heterozygous _____ e. Homozygous recessive _____



  1. Hybrid _____ f. Purebred/True-breeding ____



Share with your friends:


The database is protected by copyright ©dentisty.org 2019
send message

    Main page