Checkpoint Activity - Genetic Terms 11/18

Front

Which of the following is homozygous dominant phenotype?

Back

YY

Answer explanation

The homozygous dominant phenotype is represented by two identical dominant alleles. In this case, 'YY' indicates two dominant alleles for a trait, making it homozygous dominant. The other options include heterozygous or recessive combinations.

Front

Genotype refers to the ...

Back

the possible combination of alleles in a gene

Answer explanation

Genotype refers to the possible combination of alleles in a gene. It represents the genetic makeup of an organism, distinct from phenotype, which is the physical expression of those genes.

Front

The exact genetic makeup of an organism, such as RR, Tt, PP is its?

Back

genotype

Answer explanation

The exact genetic makeup of an organism, such as RR, Tt, PP, is referred to as its genotype. This term specifically describes the genetic constitution, distinguishing it from phenotype, which refers to observable traits.

Front

Tt is-

Back

heterozygous

Answer explanation

Tt represents a genotype with one dominant allele (T) and one recessive allele (t). This combination is classified as heterozygous, as it contains two different alleles for the same gene.

Front

Genotype or Phenotype: Black hair

Back

Phenotype

Answer explanation

Black hair is a physical characteristic that can be observed, making it a phenotype. The genotype refers to the genetic makeup, which determines traits like hair color but is not directly observable.

Front

If "T" is the allele for tall and "t" is the allele for short, in a trait with simple dominance inheritance, what phenotype would Tt produce?

Back

tall

Answer explanation

In a trait with complete dominance, the presence of the dominant allele 'T' in the genotype 'Tt' results in the tall phenotype. Therefore, 'Tt' produces a tall phenotype.

Front

Which of the following is homozygous dominant? BB, bb, Bb, BA

Back

BB

Answer explanation

The term 'homozygous dominant' refers to having two identical dominant alleles. In this case, 'BB' represents two dominant alleles for a trait, making it homozygous dominant. The other options do not meet this criterion.

Front

What does the term homozygous mean?

Back

The same allele variation is present.

Answer explanation

The term homozygous refers to having two identical alleles for a particular gene. Therefore, the correct choice is 'The same allele variation is present.' This indicates that both alleles are the same.

Front

Long hair is a dominant trait. Choose the BEST statement.

Back

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

Answer explanation

The correct choice states that the guinea pig could be homozygous dominant (HH) or heterozygous (Hh) because long hair is dominant. It can express the dominant trait with either two dominant alleles or one dominant and one recessive allele.

Front

Which of the following represents a heterozygous genotype?

Back

Aa

Answer explanation

A heterozygous genotype consists of two different alleles for a trait. 'Aa' represents this condition, with 'A' and 'a' being different alleles. In contrast, 'AA' and 'aa' are homozygous genotypes.