Monohybrid And Dihybrid Crosses
9 Questions
| Attempts: 3156
(108).jpg "Monohybrid And Dihybrid Crosses - Quiz")
Show me that you understand how to predict the possible outcome of mono and dihybrid crosses using Punnett squares. Use the following letters for your crosses: T = tall t = short G = green seeds g = yellow seeds P = purple flowers p = white flowers
Questions and Answers
- 1.A purebred pea plant for height is crossed with a hybrid for height. The phenotypic ratio is 4:0.
- A.
True
- B.
False
- 2.Check all the possible combinations of alelles in this pea plant's pollen: TtPp
- A.
TP
- B.
Tp
- C.
TT
- D.
Tp
- E.
TP
- F.
PP
- 3.A homozygous recessive plant has two copies of the ____________________ allele.
- 4.The ___________________ of the organism is what you can see.
- 5.The __________________________ of the organism is what is in the genes.
- 6.Perform the following cross and check the boxes for the correct phenotypic and genotypic ratios.
- a heterozygous green seeded plant crossed with a purebred recessive for seed color
- A.
Phenotypic ratio 2:2
- B.
Genotypic ratio 2:2
- C.
Phenotypic ratio 1:3
- D.
Genotypic ratio 1:3
- E.
Phenotypic ratio 1:2:1
- F.
Genotypic ratio 1:2:1
- 7.In the following dihybrid cross there is no need to fill out the whole sixteen square table to determine the outcome.
- TtGg x ttgg
- A.
True
- B.
False
- 8.When a purebred recessive plant is crossed with a plant with the dominant phenotype you can find out if the second plant is a hybrid or a purebred by looking at the possible offspring. Choose the correct allele combinations of the offspring if the unknown plant's genotype is homozygous dominant.
- A.
All four of the offspring will have the dominant phenotype
- B.
One will have the dominant phenotype and three will have the recessive
- C.
Two will show the dominant phenotype and two the recessive
- D.
One will have the recessive phenotype and three the dominant
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