Genotype & Phenotype

Front

What is a Genotype?

Back

The genetic makeup of an organism, represented by the alleles it possesses (e.g., Tt, BB).

Front

What is a Phenotype?

Back

The observable physical or biochemical characteristics of an organism, determined by its genotype and environment (e.g., tall, blue eyes).

Front

What does Homozygous mean?

Back

Having two identical alleles for a particular gene (e.g., BB or bb).

Front

What does Heterozygous mean?

Back

Having two different alleles for a particular gene (e.g., Bb or Tt).

Front

What is the difference between Dominant and Recessive alleles?

Back

Dominant alleles express their trait even if only one copy is present, while recessive alleles require two copies to express their trait.

Front

What is an example of a Homozygous Dominant genotype?

Back

BB (two dominant alleles).

Front

What is an example of a Homozygous Recessive genotype?

Back

bb (two recessive alleles).

Front

What is an example of a Heterozygous genotype?

Back

Bb (one dominant and one recessive allele).

Front

If pointed heads (P) are dominant to round heads (p), what is the genotype for round heads?

Back

pp (only homozygous recessive).

Front

What is the genotype for a Tall plant if T is the dominant allele for height?

Back

TT (homozygous dominant) or Tt (heterozygous).