Two-gene (dihybrid) crosses and 9
12th grade (Year 13 in England) · 16 questions · Common Core: NGSS.HS-LS3-3 · England: A level Biology: Inheritance (extension)
Name
Date
Score/ 16
Question 1
A Bb guinea pig (black fur, B dominant) is crossed with a bb (white) guinea pig. What ratio of black to white offspring is expected?
- A. 1 : 1
- B. 3 : 1
- C. 9 : 3 : 3 : 1
- D. 1 : 1 : 1 : 1
Question 2
Two pea plants, both RrYy (round, yellow seeds), are crossed. They produce 16 seeds. How many would you expect to be round and green (one dominant, one recessive)?
Answer
Question 3
Assuming the genes are on different chromosomes, how many different kinds of gamete can an organism with genotype AaBb make?
Answer
Question 4
Two guinea pigs, both BbRr, are crossed. What ratio of phenotypes is expected in the offspring?
- A. 9 : 3 : 3 : 1
- B. 1 : 1
- C. 3 : 1
- D. 1 : 1 : 1 : 1
Question 5
Two pea plants, both RrYy (round, yellow seeds), are crossed. They produce 16 seeds. How many would you expect to be round and green (one dominant, one recessive)?
Answer
Question 6
Assuming the genes are on different chromosomes, how many different kinds of gamete can an organism with genotype AaBb make?
Answer
Question 7
A Bb guinea pig (black fur, B dominant) is crossed with a bb (white) guinea pig. What ratio of black to white offspring is expected?
- A. 1 : 1 : 1 : 1
- B. 1 : 1
- C. 9 : 3 : 3 : 1
- D. 3 : 1
Question 8
Two pea plants, both RrYy (round, yellow seeds), are crossed. They produce 160 seeds. How many would you expect to be wrinkled and green (both recessive traits)?
Answer
Question 9
Assuming the genes are on different chromosomes, how many different kinds of gamete can an organism with genotype AaBbCc make?
Answer
Question 10
Two guinea pigs, both BbRr, are crossed. What ratio of phenotypes is expected in the offspring?
- A. 9 : 3 : 3 : 1
- B. 3 : 1
- C. 1 : 1 : 1 : 1
- D. 1 : 1
Question 11
Two pea plants, both RrYy (round, yellow seeds), are crossed. They produce 80 seeds. How many would you expect to be round and yellow (both dominant traits)?
Answer
Question 12
Assuming the genes are on different chromosomes, how many different kinds of gamete can an organism with genotype AaBbCc make?
Answer
Question 13
A Bb guinea pig (black fur, B dominant) is crossed with a bb (white) guinea pig. What ratio of black to white offspring is expected?
- A. 3 : 1
- B. 1 : 1 : 1 : 1
- C. 1 : 1
- D. 9 : 3 : 3 : 1
Question 14
Two pea plants, both RrYy (round, yellow seeds), are crossed. They produce 160 seeds. How many would you expect to be wrinkled and green (both recessive traits)?
Answer
Question 15
Assuming the genes are on different chromosomes, how many different kinds of gamete can an organism with genotype Aa make?
Answer
Question 16
A Bb guinea pig (black fur, B dominant) is crossed with a bb (white) guinea pig. What ratio of black to white offspring is expected?
- A. 9 : 3 : 3 : 1
- B. 3 : 1
- C. 1 : 1 : 1 : 1
- D. 1 : 1
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