EBIO 1210 Lecture Notes - Lecture 12: Mitosis, Cell Nucleus, Organelle
Document Summary
Locating genes on chromosomes: chromosomal basis for mendel"s laws (fig. The chromosomes that occur as homologous pairs in all organisms of a species are called autosomes. Chromosome pairings that can vary depending on the sex of an organism are called sex chromosomes. In most vertebrates, including humans, the x and y chromosome are the sex chromosomes: sex determination, the sry (sex-determining region on the y chromosome) gene and the. Males are haploid with respect to the genes on the sex chromosomes, a condition called hemizygous: this generates a special type of inheritance called sex-linked. Sex determination can be very different for different species: sex-linked inheritance, the probability for a male of having an x-linked genetic disease caused by a mutant recessive allele is much higher than it is for a female. Because men have only one x chromosome, they express the genes it contains whether they are dominant or recessive.