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Download Males and females can differ in sex-linked traits.
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Complex Patterns of Heredity Males and females can differ in sex-linked traits. • Genes on sex chromosomes are called sexlinked genes. – Y chromosome genes in mammals are responsible for male characteristics. – X chromosome genes in mammals affect many traits Example of Sex-Linked Traits Inheriting Sex Linked Traits • Sex Linked Traits are inherited on the X chromosome. • How would a male inherit the gene for colorblindness? • How could a female be colorblind? • Who is more likely to display a colorblind trait? Other Examples: Hemophilia, Baldness, Calico Cats Incomplete Dominance • Some traits are neither totally dominant or recessive • Offspring inherit a trait that is a blend • Example: red snapdragon x white snapdragon pink snapdragon Human Incomplete Dominance • Example- Sickle Cell Anemia Multiple Alleles and Codominance • Many genes have more than two alleles ex. Blood Type IA or IB or i Codominace Both alleles in a heterozygous match express themselves fully – Codominant alleles are neither dominant nor recessive. – The ABO blood types result from codominant alleles. A pedigree is a chart for tracing genes in a family • Phenotypes are used to infer genotypes on a pedigree. • Autosomal genes show different patterns on a pedigree than sex-linked genes. If the phenotype is more common in males, the gene is likely sex-linked.