-a cross involving two pairs of contrasting traits

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Presentation transcript:

-a cross involving two pairs of contrasting traits Dihybrid Crosses -a cross involving two pairs of contrasting traits

Two Contrasting Traits: Fur Color: B = black fur b = brown fur Fur Length: S = short fur s = long fur Possible genotypes: BBSS BbSS bbSS BBSs BbSs bbSs BBss Bbss bbss

Use FOIL to find the possible gametes of each parent. . . bS bs BbSs ( ) x BbSs ( ) BS Bs F O

Punnett Square Set Up: BS Bs bS bs BS Bs bS bs BBSS BBSs BbSS BbSs

9 3 3 1 BbSs BbSs LEGEND: B = black fur b = brown fur S = short fur s = long fur black, short? ________ brown, short? _________ black, long? _________ brown, long? __________ 3 1 BbSs BbSs X possible gametes possible gametes

heterozygous tall round X homozygous tall round What are the possible gametes for each parent below? What are the genotypes for the cross below? heterozygous tall round X homozygous tall round TtRr TTRR TR Tr tR tr TR TTRR TTRr TtRR TtRr TTRR TTRr TtRR TtRr TR TR TTRR TTRr TtRR TtRr TR TTRR TTRr TtRR TtRr tall, round tall, round tall, round tall, round

What are the genotypes of the parents in this cross? GGYY ggyy

What are the genotypes of the parents in this cross? AaBb AaBb