Dominant and Recessive Traits

Front

What are Dominant traits?

Back

Traits that are expressed in the phenotype even when only one copy of the allele is present. For example, if 'B' is a dominant allele, both 'BB' and 'Bb' will show the dominant trait.

Front

What are Recessive traits?

Back

Traits that are only expressed in the phenotype when two copies of the allele are present. For example, 'bb' will show the recessive trait, while 'Bb' will not.

Front

What does the genotype 'TT' represent?

Back

It represents a homozygous dominant genotype.

Front

What does the genotype 'tt' represent?

Back

It represents a homozygous recessive genotype.

Front

What does the genotype 'Tt' represent?

Back

It represents a heterozygous genotype.

Front

If Black phenotype is Dominant, what are the possible genotypes?

Back

The possible genotypes are 'BB' (homozygous dominant) and 'Bb' (heterozygous).

Front

How are Dominant alleles represented?

Back

Dominant alleles are always written with upper case letters.

Front

How are Recessive alleles represented?

Back

Recessive alleles are always written with lower case letters.

Front

What is the phenotype of a genotype 'Dd'?

Back

The phenotype is Dominant because 'D' is a dominant allele.

Front

What is the phenotype of a genotype 'bb'?

Back

The phenotype is Recessive because 'b' is a recessive allele.