Chapter 3-The Start of Life Genetics and Prenatal Development

Chapter 3-The Start of Life Genetics and Prenatal Development

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Chapter 3: The Start of Life: Genetics and Prenatal Development (44- 75) Key Terms (46)-Gametes: The sex cells from the mother and father that form a  new cell at conception (46)-Zygote: The new cell formed by the process of fertilization (46)-Genes: The basic unit of genetic information (46)-DNA (deoxyribonucleic acid) molecules: The substance that  genes are composed of that determines the nature of every cell in the  body and how it will function (46)-Chromosomes: Rod-shaped portions of DNA that are  organized in 23 pairs (46)-Monozygotic twins: Twins who are genetically identical (46)-Dizygotic twins: Twins who are produced when two separate  ova are fertilized by two separate sperm at roughly the same time (48)-Dominant trait: The one trait that is expressed when two  competing traits are present (48)-Recessive trait: A trait within an organism that is present but  is not expressed (48)-Genotype: The underlying combination of genetic material  present (but not outwardly visible) in an organism
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(48)-Phenotype: An observable trait: the trait that actually is seen (49)—Homozygous: Inheriting from parents similar genes for a  given trait
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Chapter 3-The Start of Life Genetics and Prenatal Development

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