Mrs. Percy's Website



Complex Patterns of Inheritance Guided NotesIncomplete Dominance-Occurs when a _________________ phenotype is somewhere between the two ____________________ phenotypes. Neither allele is completely ______________ or recessive. Example: When plants that are homozygous for _______ flowers are crossed with plants that are homozygous for ___________ flowers, the offspring have pink flowers.Codominance-Occurs when both alleles for a gene are expressed __________________, neither allele is dominant or recessive (both traits are fully ____________________). Occurs in heterozygous individuals. Example: a plant that is homozygous for red flowers is crossed with a plant that is ___________________ for white flowers. The ________________ will have some red areas and some white areas. Sex-Linked Genes-___________ (genes) that are located on the sex chromosome are sex-linked. In mammals, individuals with two X chromosomes, an _____ genotype, are _____________. Individuals with one X and one Y, an ______ genotype, are __________. The father’s gametes determine the ________ of an organism. Many sex-linked traits are carried on the ____ chromosome.Sex-Linked Disorders in Humans-Some genetic disorders are sex-linked such as Duchenne Muscular Dystrophy, ________________ and color blindness. __________ are more likely to be affected by sex-linked disorders because they only have one _____ chromosome.Polygenic Traits-________________ traits produced by _______ or more genes. Example: human skin color is a result of _______ genes that interact to produce a continuous range of colors. As many as ______ different genes determine eye color, but two main genes stand out and are __________________. ................
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