PLSC 363 Chapter Notes - Chapter 12: Zygosity, Y Chromosome, Gamete
Document Summary
12. 1 mendelian inheritance has its physical basis in the behavior of chromosomes. Chromosome theory of inheritance - genes have specific loci (positions) along chromosomes, and the chromosomes undergo segregation and independent assortment. Wild type - phenotype for a character most commonly observed. Mutant phenotypes - traits that are alternatives to the wild type if on x chromosome, it is recessive for females and dominant for males since males only have one x. 12. 2 sex-linked genes exhibit unique patterns of inheritance. Sex-linked gene - gene located on sex chromosome. Hemizygous - male inheriting recessive trait from mother. Duchenne muscular dystrophy - weakening of muscles and loss of coordination. Hemophilia - x-linked recessive disorder defined by the absence of one or more proteins required for blood clotting. Barr body - inactive x chromosome in female inside nuclear envelope. 12. 3 linked genes tend to be inherited together because they are located near each other on the same chromosome.
