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When are chromosomes copied3/18/2023 ![]() Mitosis causes the number of chromosomes to double to 92, and then split in half back to 46. ![]() Mitosis (my-TOH-sis) is the dividing of all other cells in the body. Errors during dividing of other cells (mitosis) But newer studies suggest that rare abnormalities do occur. So age doesn’t increase the risk for chromosome abnormalities for older fathers a lot. You may be referred for genetic counseling or testing if you’re age 35 or older when you are pregnant. If a woman is 35 years old, the eggs in the ovaries are also 35 years old. Women are born with all of their eggs already in their ovaries. This is because errors in meiosis may be more likely to happen as a result of the aging process. Or they can cause health problems in a child.Ī woman age 35 years or older is at higher risk of having a baby with a chromosomal abnormality. When a sperm fertilizes an egg, the union leads to a baby with 46 chromosomes.īut if meiosis doesn’t happen normally, a baby may have an extra chromosome (trisomy), or have a missing chromosome (monosomy). Normally, meiosis causes each parent to give 23 chromosomes to a pregnancy. Meiosis is the start of the process of how a baby grows. Meiosis (my-OH-sis) is the process in which sex cells divide and create new sex cells with half the number of chromosomes. Chromosome abnormalities often happen due to one or more of these:Įrrors during dividing of sex cells (meiosis)Įrrors during dividing of other cells (mitosis)Įxposure to substances that cause birth defects (teratogens) Abnormal chromosomes most often happen as a result of an error during cell division. When a chromosome is abnormal, it can cause health problems in the body. Each cell has 46 chromosomes grouped in 23 pairs. Medical Genetics: How Chromosome Abnormalities HappenĬhromosomes are stick-shaped structures in the middle of each cell in the body.
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