HPsych-Chapter2:Gene
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each of the black spaces below before clicking
on it to display the answer.
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| number of chromosomes in humans | 23
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| percent related to either parent or any sibling | 50%
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| homozygote dominant/recessive cross results | all heterozygotes
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| heterozygote and homozygote recessive cross results | 1/2 homozygote recessive, 1/2 heterozygote
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| two heterozygotes cross | 1/2 heterozygotes, 1/4 homozygous recessive, 1/4 homozygous dominant
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| components of gene transmission | dominant and recessive and any complications to simple dominance
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| complications to simple dominance | multiple gene effects, sex linkage, codominance, parental coding, crossing over, and x-deactivation
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| 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)
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| examples of sex linkage | hemophilia (skips a generation when manifesting), color blindness-- usually affects males more frequently
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| codominance | two dominant genes can produce their effects together (Ex. the ABO blood typing system-- A and B are both dominant)
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| parental coding | gene expression is affected by which parent you got it from
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| crossing over | homologous pairs exchange parts of chromosomes to create new genetic combinations
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| 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)
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Created by:
Jean-O
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