Down Syndrome Essays -- essays research papers

sometimes when meiosis ( the incision of reproductive cells ) occurs, chromosomes may be lost, left behind, or too many another(prenominal) may be passed on, resulting in the birth of a child with a genetic or congenital defect or disease. One of the nigh common of these genetic disorders is Down syndrome. This disorder takes its appoint from Dr. Langdon Down, who was the first to nominate it formally, in 1866.Down syndrome is a condition mark by freakish physical and mental development that is caused by a genetic defect. This genetic defect is caused by an scanty chromosome. People natural with Down syndrome amaze 47 chromosomes comp ared to the normal amount of 46, 23 chromosomes contagious from each parent. This extra chromosome originates more often in the mothers egg than the fathers sperm. Chromosomes are individual, grownup deoxyribonucleic acid molecules in a cell nucleus. They contain the genes along with structures that hold the deoxyribonucleic acid and aid it in expressing heredity by orchestrating cellular operations. Down syndrome is wizard of the most common chromosomal abnormalities, occurring in ab divulge 1 out of 800 births. However, the frequency of the disorder varies greatly according to the be on of the mother. For women in their twenties the rate is 1 in 2,000 but it rises steeply to 1 in 100 by the time a charwoman reaches 40. Down syndrome is ordinarily recognized soon after birth because of feature of speech facial features such(prenominal) as a flattened nose, upward lie of the eyes, a large tongue that often protrudes from a smal... Down Syndrome Essays -- essays research papers Sometimes when meiosis ( the division of reproductive cells ) occurs, chromosomes may be lost, left behind, or too many may be passed on, resulting in the birth of a child with a genetic or congenital defect or disease. One of the most common of these genetic disorders is Down syndrome. This disorder takes its name from Dr. Langdon Down, who was the first to describe it formally, in 1866.Down syndrome is a condition marked by abnormal physical and mental development that is caused by a genetic defect. This genetic defect is caused by an extra chromosome. People born with Down syndrome have 47 chromosomes compared to the normal amount of 46, 23 chromosomes inherited from each parent. This extra chromosome originates more often in the mothers egg than the fathers sperm. Chromosomes are individual, large DNA molecules in a cell nucleus. They contain the genes along with structures that hold the DNA and aid it in expressing heredity by orchestrating cellular operations. Down syndrome is one of the most common chromosomal abnormalities, occurring in roughly 1 out of 800 births. However, the frequency of the disorder varies greatly according to the age of the mother. For women in their twenties the rate is 1 in 2,000 but it rises steeply to 1 in 100 by the time a woman reaches 40. Down syndrome is usual ly recognized soon after birth because of characteristic facial features such as a flattened nose, upward slanting of the eyes, a large tongue that often protrudes from a smal...