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HPsych-Chapter2:Gene

QuestionAnswer
number of chromosomes in humans 23
percent related to either parent or any sibling 50%
homozygote dominant/recessive cross results all heterozygotes
heterozygote and homozygote recessive cross results 1/2 homozygote recessive, 1/2 heterozygote
two heterozygotes cross 1/2 heterozygotes, 1/4 homozygous recessive, 1/4 homozygous dominant
components of gene transmission dominant and recessive and any complications to simple dominance
complications to simple dominance multiple gene effects, sex linkage, codominance, parental coding, crossing over, and x-deactivation
example of multiple gene effects partial albino gene at a different chromosome affects hamster coat color (if recessive, they get a normal color. if not, albino trumps the color coded on the other chromosome)
examples of sex linkage hemophilia (skips a generation when manifesting), color blindness-- usually affects males more frequently
codominance two dominant genes can produce their effects together (Ex. the ABO blood typing system-- A and B are both dominant)
parental coding gene expression is affected by which parent you got it from
crossing over homologous pairs exchange parts of chromosomes to create new genetic combinations
x-deactivation one X chromosome turns off in different cells during development of females to rectify the unbalance between males (XY) and females (XX) (Ex. calico cats)
Created by: Jean-O on 2009-09-29



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