Genetics Chapter 9-2

Parent Generation P1 The 2 organisms that are used to reproduce

F1 generation The offspring - babies

F2 generation The babies of the F1 or the grandchildren of the P1

Punnett Square A way of organizing genetics so that scientist can determine the genotype of the offspring of 2 individuals

Monohybrid One cross because you are looking at only one trait

Dihybrid Two crosses - you are looking at 2 traits

Monohybrid Punnett Square Problems Height – tall is dominant to short Symbol for tall _______ Symbol for short _____ Phenotype: –Homozygous tall male X short female Genotype: –Male _____ X Female ______

P1 Punnett Square –F1 genotype ratio –F1 phenotype ratio

Monohybrid Punnett Square Problems Hairline: widows peak is dominant to no widows peak Symbol for widows peak _______ Symbol for no widows peak _____ Phenotype: no widows peak male X widows peak (heterozygous) female Genotype: –Male _____ X Female ______

F1 Punnett Square –F1 genotype ratio –F1 phenotype ratio

Monohybrid Punnett Square Problems Eyebrows: bushy eyebrows dominant to fine eyebrows Symbol for bushy _______ Symbol for fine _____ Phenotype: fine eyebrows male X homozygous bushy eyebrows female Genotype: –Male _____ X Female ______

F1 Punnett Square –F1 genotype ratio –F1 phenotype ratio