Chapter 2 - Genetic and Environmental Foundations Flashcards
An individual’s genetic information
Genotype
An individual’s directly observable characteristics
Phenotype
Rodlike structures within the cells that store and transmit genetic information
Chromosomes
The chemical substance that makes up chromosomes
DNA
Segment of DNA along the length of the chromosomes
Gene
Process by which DNA duplicates itself. Produces new body cells containing the SAME genetic information
Mitosis
Process by which gametes are formed. Leads to genetic variability
Meiosis
22 matching pairs of chromosomes
Autosomes
23rd pair of chromes
Sex chromosomes
XX
Female
XY
Male
Sex cells: sperm and ovum
Gametes
Formed when sperm and ovum unite
Zygote
A result when a single zygote separates to form 2 individuals
Identical twins/Monozygotic
A result from the release and fertilization of two separate ova
Fraternal/Dizygotic