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In a certain plant, yellow fruit colour ...

In a certain plant, yellow fruit colour (Y) is dominant to green (y) and round shape (R) is dominant to oval (r). The two genes involved are located on different chromosomes. Which of the above will result when plant YyRr is self-pollinated?

A

9:3:3:1 ratio of phenotypes only

B

9:3:3:1 ratio of genotypes only

C

1:1:1:1 ratio of phenotypes only

D

1:1:1:1 ratio of phenotypes and genotypes

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem of determining the phenotypic ratio resulting from the self-pollination of a plant with the genotype YyRr, we will follow these steps: ### Step 1: Identify the Genotypes The plant YyRr has two traits: - Fruit color: Yellow (Y) is dominant over green (y). - Fruit shape: Round (R) is dominant over oval (r). ### Step 2: Determine Gametes When the plant YyRr is self-pollinated, it can produce gametes that carry different combinations of alleles. The possible gametes from YyRr are: - YR (Yellow, Round) - Yr (Yellow, Oval) - yR (Green, Round) - yr (Green, Oval) ### Step 3: Create a Punnett Square To find the offspring's genotypes, we will set up a Punnett square using the gametes from both parents (YyRr x YyRr). ``` YR Yr yR yr --------------------------- YR | YYRR | YYRr | YyRR | YyRr | --------------------------- Yr | YYRr | YYrr | YyRr | Yyrr | --------------------------- yR | YyRR | YyRr | yyRR | yyRr | --------------------------- yr | YyRr | Yyrr | yyRr | yyrr | --------------------------- ``` ### Step 4: Count the Phenotypes Now, we will count the phenotypes based on the combinations in the Punnett square: - Yellow and Round (YYRR, YYRr, YyRR, YyRr): 9 - Yellow and Oval (YYrr, Yyrr): 3 - Green and Round (yyRR, yyRr): 3 - Green and Oval (yyrr): 1 ### Step 5: Determine the Phenotypic Ratio From the counts: - Yellow Round: 9 - Yellow Oval: 3 - Green Round: 3 - Green Oval: 1 Thus, the phenotypic ratio is **9:3:3:1**. ### Final Answer When the plant YyRr is self-pollinated, the resulting phenotypic ratio will be **9:3:3:1**. ---
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