Monohybrid Punnett Squares

Multiple Choice

Which of the choices is heterozygous?

• Bb

• bb

Multiple Choice

Which of the choices is homozygous recessive?

• BB

• bb

Multiple Choice

This type of allele masks the recessive allele and is capital ________________

• Dominant
• Homozygous
• Genotype
• Phenotype

Multiple Choice

What allele combination should go in the missing box?

• AA
• Aa
• aa
• none of these

Multiple Choice

T - tall and t = short
In the punnett square below, what belongs in the missing square

• tt
• Tt
• Bb
• TT

Genotype and phenotype ratio and percentages

In four squares, each square represents 25% of the total or 1/4.

Multiple Choice

The genotypic ratio here is

• 25% blue eye 75 % brown eye 
• BB = 25% Bb = 50% bb = 25%
• BB= 50 % bb = 50%
• All brown eye

Homozygous and Heterozygous REVIEW

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What does "probability" mean?

• It means the chance that something will happen.

• In genetics, we are asking what the chances are that this trait will come out.

What does dominant mean?

• Dominant means the stronger of the two genes.

•  It will mask the effect of the other gene.

What does recesssive mean?

• Recessive means a trait that is overpowered by the dominant trait.

Multiple Choice

What does dominant mean?

• It means the stronger of the two genes.

• It means a trait that is overpowered by the dominant trait.

Multiple Choice

What does recessive mean?

• It means the stronger of the two genes.

• It means a trait that is overpowered by the dominant trait.

How are dominant and recessive traits written? 

• Dominant traits are written with a capital letter.

• Recessive traits are written with a lowercase letter.

Multiple Choice

How are dominant traits written?

• They are written with a capital letter.

• They are written with both capital and lower case letters.

Multiple Choice

How are recessive traits written?

• They are written with a lower case letter.

• They are written with a capital letter.

• They are written with both capital and lower case letters.

Homozygous versus Heterozygous

What is the difference???

What does homozygous mean???

• Homozygous means that an individual has 2 genes that alike - BOTH are dominant or BOTH are recessive.

• BOTH are capital or BOTH are lower case.

What does heterozygous mean???

• Heterozygous means that an individual has different genes-one dominant and one recessive.

• One letter is capital and the other one is lower case.

• Examples: Bb, Cc. Mm, Tt, Hh

Multiple Choice

What does homozygous mean?

• It means that an individual has 2 genes that alike - BOTH are dominant or BOTH are recessive.

• It means that an individual has different genes-one dominant and one recessive.

Multiple Choice

What does heterozygous mean?

• It means that an individual has 2 genes that alike - BOTH are dominant or BOTH are recessive.

• It means that an individual has different genes-one dominant and one recessive.

How are homozygous dominant traits written?

• Homozygous dominant traits are written with 2 capital letters.

• Examples: LL, TT, JJ 

How are homozygous recessive traits written?

• Homozygous recessive traits are written with 2 lowercase letters.

• Examples: tt, rr, jj

Multiple Choice

Which of the following is an example of a homozygous dominant trait?

• Gg

• GG

Multiple Choice

Which of the following is an example of a homozygous dominant trait?

• RR

• Gg

Multiple Choice

Which of the following is an example of a homozygous recessive trait?

• hh

• WW

Multiple Choice

How are heterozygous traits written?

• hh

• Gg