It zigzags from maternal grandfather through a carrier daughter to a grandson:
Correct answer: D. Hemophilia - A and B
- A. Hemophilia - A
- B. Hemophilia - C
- C. Hemophilia - B
- D. Hemophilia - A and B
Explanation
All X-linked recessive traits exhibit zigzag inheritance.An affected male will transfer his single X chromosome (Xh) to his daughter and other X chromosome will be contributed by mother (XH).Thus daughter will be carrier(XHXh). Now she will produce two types of gametes i.e. 50% XH and 50% Xh. Her son getting Xh from mother will be hemophiliac.Thus the gene of disorder of maternal grandfather after passing through female gender in next generation appears again in male gender in third generation.
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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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More Inheritance questions
Pick up the disorder that occurs by one recessive allele in men but by two recessive alleles in women:
Chances for a man to be affected by Hemophilia - A and B are:
Type of Hemophilia which affects both men and women equally is:
Hemophilia A and B always pass from:
A hemophiliac father passes his 'h' gene directly to his:
A hemophiliac man receives 'Xh' indirectly from his: