name_________________________________
GENETICS SLIDES #5
1. What is meant by a “dihybrid” ?
2. How many different gamete genotypes are possible in a dihybrid cross ?_____
3. How many boxes are needed in a dihybrid Punnett Square ?________
4. Show a dihybrid cross between two peas that happen to both be heterozygous
round and yellow peas.
5. What is the phenotypic ratio of the offspring? _____ _____ _____ _____
6. Show a cross between a pure wrinkled green pea plant and a pure yellow and
round pea plant. Give ratios for offspring
7. (on the back) Big feet are dominant over small feet in kangaroos. Tall ears are
dominant over short ears. Show a cross between two hybrid ‘roos and give the
ratios of offspsring kanga’s.