An alternative form a gene (one member of a pair) that is located on a chromosome

the expression of a trait that occurs when the dominant form of the allele is absent

The physical expression of an organism's genetic make-up

A short segment of DNA, that tell the body how to build a protein, and codes for a specific physical trait.

a trait that is determined by an allele found only on the sex chromosomes (XX or XY).

a trait where the dominant allele does NOT completely express itself. It shows a BLEND

A trait where the heterozygous genotype produces characteristics of both alleles----a sharing of dominance between two alleles.

What process does this figure show?

The observable expression of an allele pair is called a _______.

The process by which haploid gametes combine is called _______.

Crossing over results in ______.

Down syndrome results from a(n) ______ chromosome.

Which statement is NOT true of carriers

In a pedigree, how can you tell which family members are carriers

This punnett square shows incomplete dominance in snap dragons. What do the Rr alleles represent?

What does the TT represent in this Punnett square?

an individual who is heterozygous for a recessive disorder

Human blood groups are determined by