Psychology- Human Development, Papalia Ch-3 with Complete Solutions

Psychology- Human Development, Papalia Ch-3 with Complete Solutions fertilization union of sperm and ovum to produce a zygote; also called conception zygote one-celled organism resulting form fertilization dizygotic twins twins conceived by the union of two different ova(or a single ovum that has split) with two different sperm cells; also called fraternal twins; they are no more alike genetically than other siblings monozygotic twins twins resulting from the division of a single zygote after fertilization; also called identical twins; they are genetically similar deoxyribonucleic acid (DNA) chemical that carries inherited instructions for the development of all cellular forms of life genetic code sequence of bases within the DNA molecule; governs the formation of proteins that determine the structure and functions of living cells chromosomes coils of DNA that consist of genes genes small segments of DNA located in definite positions on particular chromosomes; functional units of heredity human genome complete sequence of genes in the human body mutations permanent alterations in genes or chromosomes that may produce harmful characteristics autosomes in humans, the 22 pairs of chromosomes not related to sexual expresison sex chromosomes pair of chromosomes that determines sex: XX in the normal human female, XY in the normal human make alleles two or more alternative forms of a gene that occupy the same position on paired chromosomes and affect the same trait homozygous possessing two identical alleles for a trait heterozygous possessing differing alleles for a trait dominant inheritance pattern of inheritance in which, when a child receives different alleles, only the dominant one is expressed recessive inheritance pattern o inheritance in which a child receives identical recessive alleles, resulting in expression of a nondominant trait polygenic inheritance pattern if inheritance in which multiple genes at different sites on chromosomes affect a complex trait phenotype observable characteristics of a person genotype genetic makeup of a person, containing both expressed and unexpressed characteristics multifactorial transmission combination of genetic and