Ch 9 Punnett Squares

Chapter 9: Genetics (cont.) Monohybrid Crosses: Cross Tt x Tt. What will th geno type and phenotype be? T

t

T

TT

Tt

t

Tt

tt

P1: Tt x Tt F1: TT : 2Tt : tt F1: 3 Tall: 1 Short

Cross Yy x yy. Genotype P1? F1? Phenotype F1? y

y

Y

Yy Yy

y

yy yy

P1: Yy x yy F1: 2 Yy : 2 yy F1: 2 Yellow : 2 Green

Cross Aa x aa. Genotype P1? F1? Phenotype F1? a

a

A

Aa Aa

a

aa aa

P1: Aa x aa F1: 2 Aa x 2 aa F1: 2 Axial : 2 Terminal

Dihybrid Crosses Ry Ry Ry Ry rY RrYy -

-

-

rY

-

-

-

-

rY rY

-

-

-

-

P1: RRyy x rrYY F1: All (16) RrYy F1: All (16) Round and Yellow

Ry Ry rY rY Ry RRyyRRYyRrYYRrYy Ry RRyyRRyy RrYyRryy rY RrYYRrYyrrYY rrYy rY RrYyRryyrrYy rryy

P1: RrYy x RrYy F2: 9 Round and 3 Round and 3 Rough and 1 Rough and

Yellow Green Yellow Green