Genetics (definitions)

segment of DNA that codes for a protein

a very long molecule that holds our genes. has a double helix shape

two strands of DNA wind around each other like a twisted ladder

threadlike structures made of DNA molecules that contain the genes

sex cells

the fusion of sex cells to form a zygote

a single cell formed through fertilization

multi-celled stage when the zygote divides to form more cells

two different alleles

two identical alleles

genetic makeup of an organism

the physical expression of the genotype, what we see

Process by which a single parent reproduces by itself

reproduction in which cells from two parents unite to form the first cell of a new organism