Genetics

Aneuploidy refers to the condition where an organism has an abnormal number of chromosomes, such as trisomy or monosomy, but not an entire additional set of chromosomes.

If both the parents are carriers or affected by colour blindness, the progeny will inherit the defective X chromosomes, resulting in 100% of the progeny being colour blind.

Statement (C) is incorrect because DNA is not always located outside the nucleus. DNA is primarily located within the nucleus of eukaryotic cells, where it functions as the genetic material. It can also be found in mitochondria as mitochondrial DNA. Statements (A), (B), and (D) accurately describe key properties and functions of DNA.

The following statements do not represent chromosomes:
• (B) Only X Chromosomes are found in Males - This is incorrect as males have one X and one Y chromosome.
• (C) X and Y Chromosomes are found in Females - This is incorrect as females have two X chromosomes.
• (D) They can be transformed by Diet - Chromosomes cannot be altered or transformed by diet as they are genetic material.
(A) is correct because chromosomes determine genetic sex.

- Down Syndrome is caused by Trisomy-21, which means an extra copy of chromosome 21.
- Turner Syndrome occurs due to the presence of a single X chromosome (45, X).
- Klinefelter Syndrome is identified with the karyotype 47, XXY.
- Cri-du-chat Syndrome results from a deletion in chromosome 5, leading to various developmental issues.

Numerical chromosomal aberrations refer to changes in the number of whole chromosomes or sets of chromosomes, such as euploidy or aneuploidy.

The codon AUG serves as the start codon in mRNA translation and codes for the amino acid methionine.