physical characteristics of an organism (what it looks like)

one dominant and one recessive gene; hybrid

alternative forms of a gene are called ___________

If the genotype of an organism is "Tt," the organism is considered ___________.

Segments of DNA are called _______________________

Two identical alleles. Either two dominant or two recessive. 

Example - HH or TT

The study of heredity and variation...

What is another name for traits?

The two letters that code for a certain phenotype. These letters represent the alleles that have been passed from each parent. When the alleles are paired together you end up with...?

This is what it is called when the alleles of an ordered pair are different. One allele is dominant in this pair; one is recessive.

This is what it is called when the alleles of an ordered pair are the same. The pair could be dominant or recessive, but not both.