Genetics

Front

What is a homozygous dominant genotype?

Back

A homozygous dominant genotype consists of two identical dominant alleles, such as AA.

Front

What is the role of the dominant allele in a heterozygous genotype?

Back

In a heterozygous genotype, the dominant allele is expressed in the phenotype, masking the effect of the recessive allele.

Front

If shaggy fur is dominant to short fur, what does this imply about the genotypes of offspring?

Back

If shaggy fur is dominant, any offspring with at least one shaggy fur allele (A) will exhibit shaggy fur, while only those with two short fur alleles (aa) will have short fur.

Tags

NGSS.HS-LS3-1

Front

What is the definition of a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses, such as Bb or AA.

Tags

NGSS.HS-LS1-1

Front

What is the probability of producing a white guinea pig from a black guinea pig (BB) and a white guinea pig (bb)?

Back

There is a 0% chance of producing a white guinea pig from a BB and bb mating, as all offspring will inherit at least one dominant black allele.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Front

What is the difference between homozygous and heterozygous genotypes?

Back

Homozygous genotypes have two identical alleles (AA or aa), while heterozygous genotypes have two different alleles (Aa).

Front

What does it mean for an allele to be dominant?

Back

A dominant allele is one that expresses its trait in the phenotype even when only one copy is present.

Front

What is the expected phenotypic ratio of offspring from a cross between two heterozygous parents (Aa x Aa)?

Back

The expected phenotypic ratio is 3:1, with three showing the dominant trait and one showing the recessive trait.

Front

How can you determine the genotype of an organism exhibiting a dominant phenotype?

Back

To determine the genotype of an organism with a dominant phenotype, a test cross can be performed with a homozygous recessive individual.

Front

What is a recessive allele?

Back

A recessive allele is one that only expresses its trait in the phenotype when two copies are present (aa).

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2