Dihybrid Crosses - Quiz

1. A pea plant is heterozygous for flower color and is homozygous dominant for its height. Which is the correct genotype for this pea plant?

• PpTt
• Pptt
• PPTt
• PpTT
• ppTT

2. A pea plant is homozygous recessive for flower color and heterozygous for its height. Write down the genotype of this plant.

3. A pea plant has purple flowers and is short. What are its possible genotype(s)? Select all that are correct.

• pptt
• PpTt
• Pptt
• PPtt
• PpTT

4. A pea plant has the genotype PPTt. What are the possible allele combinations that its gametes can contain? Select all that apply.

• PT
• Pt
• pT
• pt

5. What is the missing offspring genotype represented by the blue square? (Note: they are the same - you should only write one offspring genotype, i.e. four letters).

6. What is the expected probability of a short pea plant with white flowers? (You will need to use the information given in both images).

• 9/16
• 3/16
• 1/16
• 0/16

7. Both parent pea plants have the same genotype. What is their genotype?

8. A student looks at the dihybrid cross shown above and comes to the conclusion that it is not possible for a tall pea plant with purple flowers to be produced in this cross. Is the student correct?

• Yes
• No

9. A pea plant that is homozygous dominant for both traits is crossed with a pea plant that is homozygous recessive for both traits. What is the only possible offspring genotype from this cross?

• PpTt
• PPtt
• ppTT
• ppTt

10. Dihybrid Crosses are genetic diagrams that follow the laws of inheritance. Who first discovered thse?

• Mozart
• Mendel
• Watson
• Franklin