Is Down syndrome caused by a recessive gene?
Down syndrome is caused by an additional copy of chromosome 21. There is not a specific "gene" that causes it, the additional copy of the chromosome leads to other changes and processes that result in the condition. It is not dominant or recessive.
Edward's syndrome is not technically recessive or dominant, because it is not caused by a single gene. Rather it happens due to a trisomy of chromosome 18 (or just of a part of said chromosome). Parent's may be healthy and still have offspring with the syndrome not because its recessive, but because the trisomy arises during meiosis of the gametes. Whatever happens to the gametes affects only the offspring not the carrier parent.
Genetic engineering could stop the Down Syndrome gene occurring in a couple's baby. The gene would of course have to be present in one of the couple's genes, even though they may not have Down syndrome themselves. Down syndrome is not caused by a gene. It is caused by an extra copy of Chromosome No. 23. That is harder to remove than an extra gene, which is possible to take care of with today's technology…
A recessive gene is one that does not show outwardly unless the organism has two copies of it. If you have only one copy of a recessive gene, your appearance is that of the dominant gene. Here are some sentences. Red hair is caused by a recessive gene. The baby had two recessive genes for Tay-Sachs disease, and did not live. You cannot tell if someone has a recessive gene just by looking at them.
Usher syndrome is inherited as an autosomal recessive trait. The term autosomal means that the mutated gene is not located on either of the chromosomes that determine a person's sex; in other words, both males and females can have the disorder and can pass along the disorder to a child. The word recessive means that to have Usher syndrome, an individual must receive a mutated form of the Usher syndrome gene from each parent. If…
Klinefelter's syndrome is neither a dominant or recessive trait. It is caused because X chromosome in the mother's egg does not divide properly, so instead of one X from the mother fusing with one Y from the father, you get two Xs fusing with one Y. Also, men with Klinefelter's syndrome cannot pass it to their children, because they are almost invariably sterile.
I what conditions is caused by a sex-linked gene klinefelters syndrome down syndrome muscular dystrophy?
Dominant gene: is the gene that takes over and recessive is the one that kinda stands down. For example RR is dominant rr is recessive and Rr is hetrozygous Add: A dominant gene will always be expressed when present, such as in the homozygous dominant genotype (RR), or heterozygous genotype (Rr). A recessive allele is only expressed when the genotype is homozygous recessive (rr).
What is an example of a genetic disease caused by the combination of genes inherited from each parent?
By the nature of Down syndrome, which is a mutation of an extra (3rd) chromosome, more than one type of the same autologous gene is active: In homeostasis, only one type of each gene is active, but as the third chromosome does not get turned off in Down syndrome, two of the same type of gene are active.
== == Down syndrome, also known as "Trisomy 21," is not caused by a single particular gene or DNA sequence. Rather, Trisomy 21 is caused by the presence of an "extra" chromosome 21 in the set inherited by a Down syndrome patient. The normal chromosome number is 46 (consisting of 2 sex chromosomes, XX or XY, and 44 non-sex chromosomes); Trisomy 21 patients thus have 47 and are denoted as 47, t21.