Homozygous and Heterozygous

Homozygous and Heterozygous REVIEW

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 lower case letter.

• 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

• GG

Multiple Choice

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

• RR

• rr

• Gg

Multiple Choice

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

• RR

• rr

• Gg

Multiple Choice

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

• hh

• WW

• Gg

Multiple Choice

How are heterozygous traits written?

• hh

• WW

• Gg