In the cells of a female mammal, one of the two X chromosomes condenses into a dense body called the
- 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.
Related questions
The separation of the two alleles of a gene so that each gamete receives only one of them is Mendel's law of
The F2 phenotypic ratio of a dihybrid cross between two heterozygotes is
To find out whether a tall pea plant is homozygous or heterozygous, it should be crossed with
The genotypic ratio of the F2 generation of a monohybrid cross is
A red flowered four o'clock plant crossed with a white flowered one gives pink flowered offspring. This is an example of