HSCI 100 Lecture Notes - Lecture 6: Punnett Square, Chromosome, Mitosis

• School: Simon Fraser University
• Department: Health Sciences
• Course: HSCI 100
• Professor: Mark Lechner

Document Summary

Human bio lecture 6 understand punnett squares and also think about what genetic information does not help genetics is not destined. Cells have 2 copies of every chromosome (diploid) Human genome consists of about 3 billion bases (25,000 genes) Different variations of genes are called alleles (aa, aa, aa) Hemizygous= half (i. e. xy male chromosome is hemizygous) Autosomes are the 22 pairs of chromosomes of homologous chromosomes. Sex chromosomes are the 1 pair (x and y) that contains genes which establish gender. Somatic cells (body cells) that have 46 chromosomes are called diploid (2n) and divide by mitosis. Germ cells (sex cells) that will divide by meiosis and create gametes that have only. Heterozygous dominant = 1 dominant and 1 recessive (tt) Carrier= heterozygote that has single recessive allele contributing to disease/traid, but since it is recessive the trait is not expressed (tt)