Full Genetics Review

Identify the following genotype: TT

Answer explanation

What is the probability of a homozygous recessive offspring in this cross?

(don't forget the %)

If long hair is a dominant trait in guinea pigs. Choose the BEST statement.

• This guinea pig received two dominant traits. (HH)

• This guinea pig cannot have a recessive allele. (h)

• This guinea pig could be homozygous dominant (HH) or heterozygous (Hh)

• This guinea pig is homozygous recessive (hh)

The dominant phenotype in this punnett square is (a)  

• yellow pea seeds
• green pea seeds
• there is no dominant seed

Match the following

• allele combination

• Homozygous

  Dominant

• hh

• Genotype

• Hh

• Allele

• HH

• Homozygous

  Recessive

• variation of a gene

• Heterozygous

Answer explanation

Suppose a person is a carrier for a genetic disorder. Which of the following phrases about this person is true?

• does not have the disorder but can pass it on

• will develop the disorder only late in life.

• cannot pass the disorder to sons, just daughters

• the allele is not passed on due to the Y chromosome inactivation

What nitrogen bases can be found in every living organism?

• Adenine

• Thymine

• Guanine

• Cytosine

Answer explanation

All living organisms will have all the 4 nitrogen bases that are found in DNA.

Tags

DNA

DNA Structure

DNA Function

What type of dominance is being expressed in the image?

Answer explanation

What is the probability of a homozygous dominant offspring with the following parental cross?

Hh x hh

(don't forget the %)

Answer explanation

It is not possible to have any homozygous dominant offspring from the following parental cross:

Hh x hh

An offspring would need to inherit 1 dominant allele from each parent.

Which offspring genotype is not possible from the following parental cross?

Rr x RR?

Answer explanation

It is not possible to have any homozygous recessive offspring from the following parental cross:

Rr x RR

Offspring would need to inherit one recessive allele from each parent