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West Hills High School DNA & Genetics
Mrs. McDowell genetics DNA West Hills High School biology
a molecule that holds the instructions for specific traits
the "molecule of life"
small section of DNA
a "recipe" for a single trait
example: blue eyes
chromosome pair #23
XX = female, XY = male
Qq, Rr, Aa
"father of genetics"
studied heredity of peas
chromosome pairs #1-#22
part of the cell that contains the DNA
qq, rr, aa
"type of genes"
examples: AA, Aa, aa
trait that is always expressed when present
can "hide" a recessive allele
trait that can be "hidden" or "masked" in a carrier by a dominant allele
a characteristic, such as a physical feature, that is genetically determined
DNA is "packaged" into these X shaped structures
humans have 46 (23 from mom, 23 from dad)
the field of biology that studies heredity
passing on of physical traits from parent to offspring
genetic differences in a population
(both among / within a species and between different species)
QQ, RR, AA
alternate form of a gene
example: allele T = tall & allele t = short
a type of grid used to show alleles of each parent and the possible genotypes & phenotypes of their offspring