The genome is the total genetic complement of the cell. In humans this is about 3 billion nucleotides in a haploid genome (sperm or egg cell). Given a rough estimate of 100,000 genes per genome and 1000 base pairs (bp) per gene, this adds up to 10 5 x 10 3 = 10 8 , or only 10% of our genome!! What the hell is all the rest of it for?? Good question (more late on Molecular Evolution), but it appears to be spacer DNA and repetitive DNA. MENDELIAN GENETICS Adult human (mice, fruit flies, etc.) are diploid organisms having received one set of chromosomes from the mother and one from the father. Humans have 46 chromosomes in 23 pairs; each pair is made up of one maternal and one paternal chromosome. The sex chromosomes are a "pair" in females (two X chromosomes), but in males the X and Y sex chromosomes are very different in size. The other 22 pairs of chromosomes are autosomes. The chromosomes need not segregate as a "top" and "bottom" set together because there is independent assortment of
This is the end of the preview.
access the rest of the document.