Which of the following is the correct definition for a phenotype? 1:The physical expression of a gene. (Characteristics).

2:The expression of one of your parents traits.

3:The set of genes in our DNA which is responsible for a particular trait.

1-physical expression of a gene

Explanation:

remember:

Phenotype= Physical appearance (e.g blue eyes)

Genotype=Gene (e.g gene for cancer)

1:The physical expression of a gene. (Characteristics).

Explanation:

Phenotype is how a gene is expressed. It is the 'appearance' or so called 'characteristics' of an organism resulting from its genotype.

For example:

The genotype is 1TT : 2Tt : 1tt

(T is for tall and t is for short)

The phenotype is 3Tall : 1short

The heterozygous allele is considered a Tall since the dominant allele is expressed.

the tricuspid valve is present between right atrium and right ventricle