Genetics Background:Gregor Mendel First man to understand genetics He studied inheritance in Pea Plants Experimented with cross pollination Discovered difference between dominant and recessive traits. http://en.wikipedia.org/wiki/Gregor_mendel
Dominant vs. Recessive Dominant trait always appears when present Recessive traits can recede in background Need two recessive alleles for trait to show
Gregor Mendel's Punnett Square Dominant Allele Recessive Allele
Homozygous vs. Heterozygous Homozygous = Two same alleles to make up a trait Ex. BB, bb Heterozygous = Two different alleles Ex. Bb www.en.wikipedia.org/wiki/genotypes
Genes Hold info to build / maintain cells Pass genetic info to offspring Make up a sequence of DNA www.en.wikipedia.org/wiki/Gene
Allele Make up part of a gene Make up trait of a organism Need two alleles to make up a trait
Genotype Full heredity information Determined fully by DNA Usually refers to specific character http://en.wikipedia.org/wiki/Genotype-phenotype_distinction
Phenotype Trait of organism Molecular, physical, behavioral Determined by genes as well as environment Also effected by evolution / natural selection Genotype + Environment = Phenotype www.wiki.org/wiki/phenotype
Natural Selection Evolution of an organism Change occurs to help organism survive / reproduce Changes phenotype not genotype
Inherited Traits Traits of a person determined by genes Not something that can be changed Ex. Eye color, skin color
Environmental or Acquired Traits Things that effect organism that are learned Not effected by genes of organism Ex. Language a person speaks or accent
Build your own Punnett Square Fill in the blanks
Review Which of the following is a example of a Inherited trait? Hair color Favorite food Accent
Review Fill in the blank Genotype + __________ = Phenotype Is the allele combination BB or bb an example of homozygous or heterozygous trait?
Gregor Mendel studied cross-pollination in which type of plant?
Rose Pea plant Corn
Are traits inherited, learned or a combination of both?