PSYCH 1XX3 Lecture Notes - Lecture 1: Egg Cell, Twin, Zygote
19 Apr 2020
School
Department
Course
Professor
Document Summary
Unit 1: introduction to hereditary transmission: chromosome and genes, when a sperm penetrates an ovum, a new zygote is formed. This cell contains 46 chromosomes, 23 from each parent. A chromosome is a threadlike structure that is made from dna. Segments of dna comprise genes, which provide the chemical code for development. Our chromosomes contain between 30 000 to 40 000 genes: the zygote quickly divides at an exponential rate. Each different cells has 46 chromosomes: cell division, each parent can produce more than 8 million different genetic combinations. 40,000 genes that make up your genotype: the expression of genotype into phenotype for particular traits can follow one of several patterns of inheritance (simple dominant-recessive inheritance, polygenetic. Inheritance, codominance, sex-linked inheritance: siblings with the same parents may have different eye colors, simple dominant-recessive inheritance, the expression of a trait is determined by a single pair of genes called alleles.
