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Michael and Susan have a son (Richard) with Down Syndrome. Richard is the first child in...

Michael and Susan have a son (Richard) with Down Syndrome. Richard is the first child in the family ever to be diagnosed with Down Syndrome. What is Richard’s likely Karyotype?

a. 46 XY

b. 45 XY

c. 47 XX

d. 47 XY

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Answer #1

d.47 XY.Down syndrome is a chromosomal abnormality characterized by the presence of an extra copy of genetic material on the 21st chromosome, either in whole (trisomy 21) or part (such as due to translocations).A typical human karyotype is designated as 46,XX or 46,XY, indicating 46 chromosomes with an XX arrangement for females and 46 chromosomes with an XY arrangement for males.Since Richard is a boy/Male, he will have 47 XY karyotype,

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