Doctor insights on:
Are Lazy Eyes Inherited Dominant Or Recessive
Genetics mostly: Eye color primarily determined by genes from your parents. Blue eye color for instance requires one recessive blue gene from each parent. Brown iris gene is dominant over blue so if child gets blue gene from mom and brown gene from dad then child will have light brown iris rather than blue. Certain diseases, eye trauma, and medications may alter eye color from original eye color after birth. ...Read more
Is there a test to find out which combination of eye colour genes (recessive/dominant/colours) a person carries?
I am doing a presentation for my class on down syndrome and I need to know why it isn't dominant or recessive.
P.S. I need a simplified answer
Neither: 90-90% of case of ALS are not inherited, it occurs at random at its cause is not known. In 5-10% of cases there is a familial form of the disease. In these 5-10% of cases it is usually dominant (meaning it is only necessary to have one copy of the defective gene) remember however most of the time it is not inherited at all. ...Read moreSee 1 more doctor answer
Autosomal dominant: It is an autosomal dominant disorder. There is high risk of spontaneous mutations. See this site for more info. http://www.nlm.nih.gov/medlineplus/ency/article/001577.htm. ...Read more
X-linked: It is an X-linked inheritance. That means it is found as a mutation on the X chromosome . Males are XY and so one gene mutation in that X chromosome that affects the alpa-galactosidase enzyme will cause the disease. Females are XX and so if one x chromosome has the mutation ,they will often experience a lesser form of Fabry Disease or no symptoms at all. ...Read more
Input required: In dominant disorders, the dominant member of the gene pair controls how the gene activities are expressed, so the other gene can carry the same or normal information.In recessive disorders, the normal gene compensates for the bad information in the other gene, allowing a person to function normally unless both genes carry the bad information. ...Read more
Neither: Any defect like trisomy 13, that involves acquiring an extra chromosome, has nothing to do with dominant or recessive genes. It occurs when usually the egg carries 2 rather than 1 of the 13 chromosomes. Fertilization by a normal sperm with one of every chromosome creates an embryo with three # 13's.If the embryo survives pregnancy it emerges as a trisomy 13 infant with all the problems they have. ...Read more
None of the above: Edward syndrome is brought on by an abnormality of chromosome numbers, specifically an extra 18. The abnormal egg with a single chromosome 1-17 & 19-22 + x has a pair of 18's. When the sperm brings a single chromosome 1-22 + x or y then the embryo ends up with 47 chromosomes rather than 46 in every cell.(3-18's) the excess distorts the organ building information & defects arise. ...Read moreSee 1 more doctor answer
Neither: Down syndrome happens when an extra 21 chromosome is present in all the cells of the body. It happens before conception when the donor egg fails to shed one of its 21 chromosomes in the formation of the egg & the male 21 joins the female pair & creates an embryo with 3 number 21's. ...Read more
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