NEET BIOLOGY

Detailed explanation-1: -A change in the number of chromosomes can cause problems with growth, development, and function of the body’s systems. These changes can occur during the formation of reproductive cells (eggs and sperm), in early fetal development, or in any cell after birth.

Detailed explanation-2: -A human zygote will not survive if it is missing a chromosome, unless it is one of the sex chromosomes. Otherwise, too much genetic information is absent. A female typically gets an X chromosome from each parent. Males receive an X from the mother but a Y from the father.

Detailed explanation-3: -Body cells are diploid; they have pairs of chromosomes. 3. If a zygote has too many or too few chromosomes, it will not develop properly.

Detailed explanation-4: -When a sperm fertilizes an egg, the union leads to a baby with 46 chromosomes. But if meiosis doesn’t happen normally, a baby may have an extra chromosome (trisomy), or have a missing chromosome (monosomy). These problems can cause pregnancy loss or health problems in a child.