In round worm, Ascaris incurva, the female has 42 chromosomes in the form of:
Correct answer: A. 8 pairs of X and 13 pairs of autosomes
- A. 8 pairs of X and 13 pairs of autosomes
- B. 13 pairs of X and 8 pairs of autosomes
- C. 6 pairs of X and 15 pairs of autosomes
- D. 15 pairs of X and 6 pairs of autosomes
Explanation
In the roundworm Ascaris incurva, the female has 42 chromosomes in the form of 8 pairs of compound X along with 13 pairs of autosomes (16+26). Its male has 35 chromosomes comprising 8X plus one Y along with 13 pairs of autosomes (8+1+26).
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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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