In human beings 45 chromosomes/ single X/XO abnormality causes
Correct answer: C. Turner's syndrome
- A. Down's syndrome
- B. Klinefelter's syndrome
- C. Turner's syndrome
- D. Edward's syndrome
Explanation
The correct option in this case is c) Turner's syndrome. Turner's syndrome is a chromosomal disorder that occurs in females and is characterized by the absence or partial absence of the second sex chromosome (X chromosome). Instead of the usual 46 chromosomes, individuals with Turner's syndrome have 45 chromosomes, with a single X chromosome (45,X) or with other structural abnormalities of the X chromosome.
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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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