White-eyed trait in drosophila is due to:
Correct answer: B. Mutation
- A. Linkage
- B. Mutation
- C. Crossing over
- D. Genome
- E. Gene pool
Explanation
The correct answer is b) Mutation. The white-eyed trait in Drosophila (fruit flies) is primarily due to a mutation. In the wild type, Drosophila typically has red eyes. However, a spontaneous mutation occurred in the X chromosome of a male fruit fly, resulting in a gene alteration that caused the eye colour to change to white. This mutation is inherited as an X-linked recessive trait.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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