ANS 42 Lecture Notes - Lecture 12: Lactase, X-Inactivation, Karyotype
23 Aug 2016
School
Department
Course
Professor
Document Summary
Genes are composed of dna sequences and they will guide specific products, and that goes to traits which makes a specific animal. Important in any species for sexual reproduction. Phenotype - to show type, it"s physical appearance/what it looks like. Genotype - genetic type, the genetic makeup or genetic directions, more difficult to identify o. Chromosomes - the units of dna: dna is subdivided into chromosomes o o. Come in pairs - a copy of every chromosome in a species. Chromo 1 + copy of chromo 1: dogs have 39 chromosome pairs o. Advantage = if one is defective, the other can compensate. In sexual reproduction, dna from mom and dad create the diploid state. Egg + sperm = gametes - are haploid, not paired o. 1 copy - haploid: have genes - regions of the chromosome. Represents the genetic direction for a product or a trait. Versions of dna = alleles - differences in the dna sequence.
