Genetics Complex Patterns of Inheritance. Incomplete dominance Neither trait is dominant over the other. A third phenotype is observed that is a combination.

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Presentation transcript:

Genetics Complex Patterns of Inheritance

Incomplete dominance Neither trait is dominant over the other. A third phenotype is observed that is a combination.

codominance Expression of both alleles Phenotypes of both traits are expressed Roan cows from a red parent and a white parent display both red and white appearance This roan horse is heterozygous for coat color. Its fur appears grey because it has a mixture of black and white hairs, not because the individual hair colors are grey.

sex determination Determined by sex chromosomes In humans, the chromosomes XX code for a girl while XY is a boy

Sex-linked inheritance Traits are controlled by genes located on the sex chromosomes White eyes in fruit flies Hemophilia and color blindness in humans

references d_mendel.php Information on inheritance patterns as presented for and by Mrs. Muskopf's Bio4A website quares.html Activity on practicing using Punnett Squaresctivity on practicing using Punnett Squares