Developmental Psychology

also known as conception, is the process by which sperm and ovum (sex cells) combine to create a single cell called zygote, which then duplicates itself again and again by cell division.

Fertilization

rupture of mature follicle in either ovary and expulsion of its ovum which occurs every month until menopause

Ovulation

o   also known as Fraternal Twins

§  Two separate eggs being fertilized by two different sperms

§  Can be same or different sex

§  May have genetic basis

Dizygotic Twins

o   resulted from the cleaving of one fertilized egg and are generally genetically identical

Heredity

o   long, spiraling ladder whose steps are made of pairs of chemical units called bases

Deoxyribonucleic Acid