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Unformatted text preview: resent in a population Human Blood Groups Possible alleles: IA IB i Blood Types: A = IA IA or IA i IA and IB are
B = IB IB or IB i codominant AB = IA IB
O = i i i is recessive to all others What Blood Types are Compatible?
What Blood Types are Compatible?
A = IAIA, IAi AB = IAIB B = IBIB, IBi O = ii Blood Donor Blood Recipient A
O B AB O What Blood Types are Compatible?
What Blood Types are Compatible? Blood Recipient A = IAIA, IAi AB = IAIB B = IBIB, IBi O = ii
A A B AB O B
O Can you tell which blood group is considered the Universal Donor? Polygenic Inheritance
Polygenic Inheritance refers to inheritance of a phenotypic characteristic (trait) that is attributable to two or more genes and their interaction with the environment many traits are not controlled by a single gene pair but by many genes interacting with each other and also with the environment Multiple Alleles: one gene, multiple versions Polygenic: multiple genes Polygenic Inheritance Many traits – skin color, height, etc.
produces more of a bell curve – a continuous distribution of traits Polygenic Inheritance
Polygenic Inheritance Polygenic Inheritance
Polygenic Inheritance Environmental Effects!
Environmental Effects! Siamese Cats – coat color enzyme only active at low temperatures – affects color at tips of nose, ears, tail, feet. Identical twins – in utero – one twin experiences a slightly different environment that the other – this affects some traits, including their fingerprints – Identical DNA – different fingerprints...
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This document was uploaded on 02/15/2014 for the course SCIENCE Pre-IB Bio at Richard Montgomery High.
- Fall '13