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How many non-parental gene combinations ...

How many non-parental gene combinations were obtained when Morgan crossed yellow bodies, white eyed female to brown bodied, red eyed male ?

A

`1.3%`

B

`37.2%`

C

`98.7%`

D

`62.8%`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem of how many non-parental gene combinations were obtained when Morgan crossed yellow bodies, white-eyed female to brown-bodied, red-eyed male, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Parental Traits**: - The female parent has yellow bodies and white eyes (genotype: Yy ww). - The male parent has brown bodies and red eyes (genotype: yy RR). 2. **Determine the Gametes Produced by Each Parent**: - The female can produce gametes with combinations of yellow body and white eyes (Yw) or yellow body and red eyes (Yr). - The male can produce gametes with combinations of brown body and red eyes (yR) or brown body and white eyes (yw). 3. **Perform the Cross**: - The possible combinations of offspring from these gametes can be set up in a Punnett square. - The combinations would be: - Yellow body, white eyes (Yw) - Yellow body, red eyes (Yr) - Brown body, white eyes (yw) - Brown body, red eyes (yR) 4. **Identify Parental and Non-Parental Combinations**: - Parental combinations: Yellow body, white eyes (Yw) and Brown body, red eyes (yR). - Non-parental combinations: Yellow body, red eyes (Yr) and Brown body, white eyes (yw). 5. **Calculate the Frequency of Non-Parental Combinations**: - According to Morgan's findings, the frequency of non-parental combinations (recombinants) was only 1.3% due to genetic linkage. 6. **Conclusion**: - Therefore, the number of non-parental gene combinations obtained from this cross is very low, specifically 1.3%. ### Final Answer: The number of non-parental gene combinations obtained from the cross is 1.3%.
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