PSYB32H3 Lecture Notes - Lecture 2: Cell Nucleus, Mitosis, Meiosis
Document Summary
Building blocks of life = nucleus of cell. Cell nucleus is where the dna is contained. Dna controls the growth and development of all living things including " bananas ". Dna is organized into chromosomes which is organized into 23 pairs. Mitosis is regular cell division while meiosis is the cell division of sperm and zygote cell. Dna sequence shows you your order of genotype via genome. Allele = variant of a gene, expressed as homozygous or heterozygous (xy,xx) Phenotype - how genetic makeup is expressed (ex. Other type of gene expression: co-dominance (both alleles expressed. Males have xy chromosomes (y comes from the father) Haemophilia is one such example - males are more likely to be diagnosed with this. Congenital abnormalities: present at birth that can cause either minor or sever impairment, either inherited or environmental. Chromosomal abnormalities: down syndrome - have too many of the 21 chromosome (3 duplicates)
