Genetics quiz #2

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8 Terms

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Independent assortment
the principle to see whether genes get inherited together of inherited seperatly
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Other patterns of inheritance
non-mendelian patterns of inheritance
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Polygenic traits

traits controlled by multiple different genes (more than one gene controls a trait)

ex:

  • height and weight - determined by environment

  • Hair color, eye color, skin color - melanin controls how much color it has

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Genetics and environment

Characteristics determined by genes and the environment

ex:

  • Sun → tanner (more melanin produced to protect skin from UV rays)

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Incomplete dominance

some alleles are not fully dominant and others are not fully recessive

  • neither allele is dominant or recessive

When they cross → blend

ex:

  • RR - Red

  • WW - White

  • RW - Pink

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Codominance

phenotypes produced by both alleles (in the same individual) are clearly expressed

ex:

  • BB - black chicken

  • WW - white chicken

  • BW - speckled black and white chicken

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multiple alleles

more than two alleles exist for the same trait (each individual only inherits 2, but more exist)

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Blood types

Type B

  • IB IB

  • IB i

Type A

  • IA IA

  • IA i

Type AB

  • IA IB

Type O

  • ii