In the cells of a female mammal, one of the two X chromosomes condenses into a dense body called the
Correct answer: D. Barr body
- A. centromere
- B. nucleolus
- C. chiasma
- D. Barr body
Explanation
The inactivated X, or Barr body, equalises the gene dose between XX females and XY males. Males, with a single active X, show no Barr body, which is why the test was once used to check chromosomal sex.
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About Mendel's Laws of Inheritance
Mendelian inheritance explains how alleles separate into gametes and assort during reproduction, producing predictable genotype and phenotype ratios. Questions cover dominance, recessiveness, homozygous and heterozygous conditions, the laws of segregation and independent assortment, monohybrid and dihybrid crosses, test crosses and the limits caused by linked genes.
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