BIOLOGY 1A03 Lecture Notes - Lecture 3: Hmga2, Haemophilia, Y Chromosome

• School: McMaster University
• Department: Biology
• Course: BIOLOGY 1A03
• Professor: Rosa Da Silva

Document Summary

3 billion base pairs of dna per ell. Alleles linked on a single chromosome must be able to become unlinked and recombine. Unit i: the inheritance of genes on the x chromosome. Sex-linked gene: located on either chromosome whose expression of the phenotype depends on the sex of the individual. 78 genes on the chromosome 1100 genes (most unrelated. Recessive x-linked inheritance of red/green colour-blindness: women who are heterozygous for the trait will not show the phenotype, but are, those who are homozygous will experience symptoms of the disease. Hemizygous: any male who inherits the allele from his mother will be colour-blind for he only has one x chromosome, and therefore one locus. Ishihara colour test: consists of a circle containing different colour dots with an internal dot pattern forming a number that is clearly visible with normal vision. Recessive x-linked inheritance of haemophilia: results from a mutation in a gene encoding for a protein required for blood clotting.