Heredity & Punnett Squares

An organisms visible traits is called a :

• Genotype

• Phenotype

• Phytype

• Socialtype

Why do scientists use Punnett Squares?

• Because, science

• In order to test bacteria to see if they are pathogenic

• To test the offspring of viruses

• In order to determine the possible outcomes for the offspring of two parents.

The gene combination of an organism is called a:

• Genotype

• Phenotype

• Phytype

• Socialtype

Mary has brown hair and Cameron has red hair. Mary's genotype is represented in a Punnett Square using BB and Cameron's genotype is represented with bb. Who's genotype is homozygous?

• Mary

• Cameron

• Both Mary and Cameron

• Neither Mary or Cameron

Which of the following represents a heterozygous genotype?

• bb

• Hh

• DD

• None of these

Which of the following represents a homozygous genotype?

• Tt

• RR

• Pp

• None of these

Justin and Kim are planning to start a family. Justin has brown eyes (B) and is heterozygous and Kim has blue eyes (b) and is homozygous recessive. What percent of their offspring could have blue eyes? (Below are the results of the Punnett Square)

Bb bb

Bb bb

• 0%

• 25%

• 50%

• 100%

Black hair (B) is dominant over blonde hair

(b). Jerry has blonde hair and has a homozygous genotype and Rebecca has Black hair and has a heterozygous genotype. What are the possible phenotypes of their offspring?

• Blonde

• Neither of these phenotypes

• Black and Blonde

• Black

Curly hair (s) is a recessive trait and straight hair (S) is a dominant trait. If person is homozygous recessive, what type of hair do they have?

• Straight

• Curly

• Half straight and half curly

• No hair

Freckles (F) is a dominant trait and to no freckles (f). If person is has feckles, what possible genotypes could they have?

• ff, Ff

• FF,ff

• ff

• FF, Ff