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Process of Heredity
Tracey Groomson 23 March 2011
Transcript of Process of Heredity
chromosomes = Nucleus
(except bacteria) total chemical blueprint = genotype
physical expression = phenotype (what you see) 1/2 male (23) & 1/2 female (23) Parent DNA = traits & characteristic of offspring -dominant trait = ALWAYS expressed
-recessive trait = ONLY expressed when dominant trait not present & when both parent provide recessive gene Heredity
passing traits from parent to offspring Chromosome
large molecule containing
*Draw Chromosome Punnett Square Genes = divided sections on chromosomes
* look at table in book & discuss Human Chromosomes
human body = 46 single chromosomes
OR 23 pairs
male (23) + female (23) = offspring (46) 2 chromosomes determine sex = X or Y
Females = XX (always donates X)
Males = XY (can donate either) Other 22 pair = autosomes/body chromosomes Gene
section of chromosome that code for
a specific trait = 1 from mom & 1 from dad offspring = 2 copies of each chromosome (homologous) - info about same trait, same place on chromosome
*COPY PICTURE Genotype = genes/alleles (what a specific gene is called)