in 22 of the 23 pairs of chromosomes, both members of the pair are clo a small section of a chromosome that is the basic unit for the transmission of heredity is a in 22 of the 23 pairs of chromosomes, both members of the pair are closely matched. each of these 44 chromosomes is called a(n):

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Psychology 220- Developmental Psychology Tues/Thurs 9:30-10:45am Week #3 2/2 Chapter 3: Heredity and Environment Overview:  The relationship between genes and chromosomes  Is twinning genetics or can a person chose to have twins  How a person can have genes for something that isn’t apparent  Alcoholism  Down syndrome The Genetic Code A reproductive cell is called a gamete. Sperm: male reproductive cell Ovum: female reproductive cell Zygote: a single cell that every individual starts out as, formed from the union of two gametes (a sperm and ovum). **The zygote contains all of a person’s genes. Deoxyribonucleic acid (DNA): the chemical composition of the molecules that contain the genes. DNA m