Which of the following is a correct match?
Correct answer: A. Down's syndrome, 21 st chromosome
- A. Down's syndrome, 21 st chromosome
- B. Sickle cell anaemia, X-chromosome
- C. Haemophilia, Y-chromosome
- D. Parkinson's disease, X and Y chromosome.
Explanation
The correct match is "a. Down's syndrome - 21st chromosome." Down's syndrome is caused by the presence of an extra copy of chromosome 21 (trisomy 21). The other options do not accurately match the associated genetic disorders with the chromosomes mentioned.
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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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A gene is said to be dominant if:
There are three genes a, b, c. The percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 8%. What is the sequence of genes on the chromosome?
Which of the following is an example of pleiotropy?
Two non-allelic genes produces the new phenotype when present together but fail to do so independently then it is called:
When dominant and recessive alleles express itself together it is called:
Ratio of complementary genes is: