Aboy with an extra x chromosome probably has which of the following syndromes?

down syndrome

klinefelter syndrome

xxx syndrome

Klinefelter Syndrom (also known as XXY). Males have chromosomes XY, adding another X would result in XXY.

https://en.wikipedia.org/wiki/Klinefelter_syndrome

answer; a male inherits only one allele of the x-linked gene controlling hair color;

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this