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Due to the cross between TTRr xx ttrr th...

Due to the cross between `TTRr xx` ttrr the resultant progenies showed how many percent plants tall, red flowered:

A

0.5

B

0.75

C

0.25

D

1

Text Solution

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The correct Answer is:
To solve the problem of determining the percentage of tall, red-flowered plants resulting from the cross between TTRr and ttrr, we can follow these steps: ### Step 1: Identify the Genotypes - The parental genotypes are TTRr (homozygous tall, heterozygous red) and ttrr (homozygous short, homozygous white). - T (tall) is dominant over t (short), and R (red) is dominant over r (white). ### Step 2: Determine the Gametes - The gametes produced by TTRr are TR and Tr (since it can produce T and R or T and r). - The gametes produced by ttrr are tr (since it can only produce t and r). ### Step 3: Set Up the Punnett Square - We can set up a Punnett square to visualize the possible combinations of the gametes: | | tr | |-------|------| | TR | TtRr | | Tr | Ttrr | ### Step 4: Analyze the Offspring - From the Punnett square, we can see the following genotypes: - TtRr (tall and red) - Ttrr (tall and white) ### Step 5: Determine the Phenotypes - TtRr: This genotype results in tall plants with red flowers. - Ttrr: This genotype results in tall plants with white flowers. ### Step 6: Calculate the Ratios - Out of the 2 possible progeny types, 1 is TtRr (tall and red) and 1 is Ttrr (tall and white). - Therefore, the ratio of tall red-flowered plants to total plants is 1:2. ### Step 7: Calculate the Percentage - To find the percentage of tall, red-flowered plants: - (Number of tall red-flowered plants / Total number of plants) × 100 - (1 / 2) × 100 = 50% ### Step 8: Convert to Decimal - The percentage can be expressed as a decimal: - 50% = 0.5 ### Final Answer - The percentage of plants that are tall and red-flowered is **0.5**. ---
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