Which of the following was discovered in a moth by J.Seiler in 1914?
Correct answer: C. ZZ-ZW
- A. XO-XX
- B. XY-XX
- C. ZZ-ZW
- D. None of these options are correct
Explanation
In contrast to the XY sex-determination system and the X0 sex-determination system, where the sperm determines the sex, in the ZW system, the ovum determines the sex of the offspring. Males are the homogametic sex (ZZ), while females are the heterogametic sex (ZW). The Z chromosome is larger and has more genes, like the X chromosome in the XY system. The ZZ-ZW system was discovered by J.Seiler in 1914.
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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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