Patterns of Inheritance. Vocabulary Incomplete dominance: 1 allele only partially dominant Co-dominance: both alleles for genes exposed equally Multiple.

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Presentation transcript:

Patterns of Inheritance

Vocabulary Incomplete dominance: 1 allele only partially dominant Co-dominance: both alleles for genes exposed equally Multiple alleles: 3 or more possible alleles determine trait Polygenetic inheritance: more than 1 gene effects trait

Incomplete dominance Red snapdragons crossed with white Pink snapdragons Two white- WW RR- red Capital letters- neither totally dominant RW- only a little red, a little white Appear pink

Co-dominance Neither allele dominant Black, white chickens All chickens have black, white feathers FB- black feathers FW- white feathers F- fathers Superscripts- tells you color feathers

Multiple Alleles 3 or more possible alleles determine trait Rabbits coat color ranges brownish gray- all white Depends on alleles inherited Leads to differences among siblings

Polygenetic inheritance Alleles different genes work together produce trait Broad range phenotypes Human height Plant flowering time

Acquired Traits Inherited -Vocal cords -Height -Hair color Acquired -speak languages -callus on finger- writing -haircut

Genes and environment Environmental factors influence way genes expressed Tobacco smoke Pollutants- result in cancer Changes body cells not passed to offspring Changes in sex cell Egg, sperm passed to offspring