QQuestionBiology
QuestionBiology
What is the phenotypic ratio of the offspring
| | | | | |
| --- | --- | --- | --- | --- |
| RY | RY | Ry | rY | ry |
| | RRYY | RRYY | RrYY | RrYY |
| Ry | RRYY | RRYY | RrYY | RrYY |
| rY | RrYY | RrYY | rrYY | rrYY |
| ry | RrYY | RrYY | RrYY | RrYY |
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Step 1:I'll solve this genetics problem step by step:
Step 2:: Understand the Punnett Square
The Punnett square shows the possible genotypic combinations from a dihybrid cross where: - R/r represents color gene - Y/y represents shape gene - Capital letters indicate dominant alleles - Lowercase letters indicate recessive alleles
Step 3:: Count Genotypes
- $$RrYy$$: 0 squares
Looking at the Punnett square, we can see the following genotypes:
Step 4:: Determine Phenotypic Ratios
- $$rrYY$$: Green, round
Assuming: - R is dominant for color - Y is dominant for shape Phenotypes will be:
Step 5:: Calculate Phenotypic Ratio
Total squares: 10 - Red, round: 8 / 10 = 4 / 5 - Green, round: 2 / 10 = 1 / 5
Final Answer
The phenotypic ratio is 4:1 (Red, round : Green, round)
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