1. GENETIC DISORDER
Are sex linked genes disorder or recessive and dominant genes disorders eg phenylektonuria (PKL). It is a metabolic disorder that results into mental retardation it is caused by:-
Recessive gene that is responsible for breaking down of chemical l referred to as phenylalanine.
This results to accumulation of the chemical in the blood leading to severe brain damage.
It affects the motor-coordination, leads microcephaly, hydrocephaly, it affects the vision, wide set eyes, protruding tongue e.t.c.
2. CHROMOSOMAL ABBRERATIONS.
a) Dawn’s syndrome (trysomy 21
It results from an extra 2 chromosome which leads to a total of 47 chromosomes instead of 46.
Characteristics
Heavy and heart problems, folded eye led myopic conditions, protruding tongue, small and irregular disquieting eyes, infertility.
b) Trysomy 18
Results when the 18 chromosome pairs resulting into 3 chromosomes during meosis.
Characteristics
M. retardatory, low IQ, heart disease, facial abnormalities deformed fingers and teeth.
c) Turners syndrome 38 XO lack missing one X chromosome, common in
females and characterized by short stature M. retardatory visual and
perceptual.
d) Klinefelter’s syndrome in males, have extra X chromosomes XXY, late speed,
XXY
delayed low verbal IQ
marto answered the question on April 23, 2019 at 08:31
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