Genetics

Front

What is homozygous dominant?

Back

An organism with two identical dominant alleles for a trait, represented as 'BB'.

Front

What is the phenotypic ratio when crossing two heterozygous plants (Tt x Tt) for tall (T) and short (t) traits?

Back

3:1, where 3 are tall and 1 is short.

Front

What is a recessive allele?

Back

An allele that is masked by a dominant allele and only expressed in a homozygous recessive condition, represented as 'bb'.

Front

What does genotype refer to?

Back

The genetic makeup of an organism, specifically the combination of alleles (e.g., BB, Bb, bb).

Front

What is the probability of a blue-eyed baby from two brown-eyed parents (Bb)?

Back

25%, as the possible combinations are BB, Bb, Bb, and bb.

Front

What is a Punnett Square?

Back

A diagram used to predict the outcome of a genetic cross by showing the possible allele combinations from the parents.

Front

What is the difference between phenotype and genotype?

Back

Phenotype is the physical expression of traits, while genotype is the genetic makeup.

Front

What does it mean for a trait to be dominant?

Back

A dominant trait is expressed in the phenotype even if only one dominant allele is present (e.g., T in Tt).

Front

What is the expected genotypic ratio from a monohybrid cross (Tt x Tt)?

Back

1:2:1, representing the genotypes TT, Tt, and tt.

Front

What is the significance of the allele in genetics?

Back

An allele is a variant form of a gene that determines specific traits.