The number of linkage groups in humans is?
Correct answer: B. 23
- A. 1/21
- B. 23
- C. 1/23
- D. 1/24
Explanation
Option B is correct since the number of linkage groups in humans is equal to the haploid number of chromosomes. The linkage groups refer to all the genes on a single chromosome. These groups are inherited together in an individual. The chromosomes in humans are 46 and their haploid number is 23. So linkage groups are also 23. Option A is incorrect since it states 1/21 which is wrong. Option C is incorrect since it states 1/23 which is wrong. Option D is incorrect since it states 1/24 which is wrong.
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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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