Punnett Square

What ratio of the offspring from the cross shown will be homozygous recessive for the trait of tallness?

• 0 in 4

• 1 in 4

• 2 in 4

• 4 in 4

Tags

NGSS.HS-LS3-1

Genotype refers to the ...

• physical expression of the genes

• the possible combination of alleles in a gene

• whether an allele is dominant or recessive

• how an organism will appear

Two heterozygous (Tt) tall pea plants are crossed. Which describes their offspring?

• 50% tall and 50% short

• 75%tall and 25% short

• 100%short

What is the percentage of offspring that have brown eyes?

• 100%

• 75%

• 50%

• 25%

Tags

NGSS.MS-LS3-2

Genotype refers to the ...

• physical expression of the genes

• the possible combination of alleles in a gene

• whether an allele is dominant or recessive

• how an organism will appear

If a heterozygous tall pea plant is crossed with a short pea plant, what are the possible genotypes of the future offspring?

• 100% Tt

• 50% Tt, 50% tt

• 75%Tt, 25%tt

• 25%TT, 50%Tt, 25%tt

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

• 0 %

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

A homozygous dominant dog with brown fur is crossed with a heterozygous dog with brown fur. What are the percentages of the possible genotypes?

• 100% BB

• 75% BB and 25%Bb

• 50 % BB and 50% Bb

• 50% Bb and 50% bb

Which of the following alleles is homozygous (purebred) recessive?

• Tt

• tt

• TT

• t

What is the only way a recessive trait will show?

• AA

• Aa

• aa