CAS PS 101 Lecture Notes - Lecture 11: Haemophilia A, Egg Cell, Chromosome

• School: Boston University
• Department: Psychological & Brain Sciences
• Course: CAS PS 101
• Professor: Barak Caine

Document Summary

There are definitely critical periods, especially pre/postnatal. 23 from mother paired with 23 from father. Any sequences of the bases that make up the deoxyribonucleic acid. Any sequence of dna in chromosome that codes for a protein (c, g, a, t + sugar backbones) Ex: two genes that code for blue and brown eyes in one individual, but brown is dominant so that is what appears. Ex: outward expression is brown eyes despite two genotypes. Each parent contributes half of a child"s genetic material. Sperm and ova have 23 single chromosomes (unpaired) Enables sperm and egg to fuse and create a fully paired cell with a random combination of traits. Is larger and carries more genes. A female only needs one good gene for blood-clotting, on either chromosome hemophilia is recessive in females. A male inheriting hemophilia on the cannot overcome the recessive trait because their other chromorm #23 is a y which lacks the gene for blood-clotting.