Considering that males can have Klinefelter (XXY)syndrome,XYY,and normal XY chromosomal combinations,and females can have Turner (XO)syndrome,poly-X (XXX,XXXX),and normal XX combinations,it is obvious that
A)maleness results from the presence of only one X chromosome.
B)maleness results from the absence of two or more X chromosomes.
C)maleness results from the minimal presence of one Y chromosome.
D)femaleness results from the presence of two or more X chromosomes.
E)sex determination is a delicate balance between X and Y chromosomes.

Question

Considering that males can have Klinefelter (XXY)syndrome,XYY,and normal XY chromosomal combinations,and females can have Turner (XO)syndrome,poly-X (XXX,XXXX),and normal XX combinations,it is obvious that
A)maleness results from the presence of only one X chromosome.
B)maleness results from the absence of two or more X chromosomes.
C)maleness results from the minimal presence of one Y chromosome.
D)femaleness results from the presence of two or more X chromosomes.
E)sex determination is a delicate balance between X and Y chromosomes.

Quizplus · Accepted Answer

Studies have shown that the minimal presence of one Y chromosome is necessary for the development of male reproductive organs and secondary sex characteristics. Thus, maleness results from the minimal presence of one Y chromosome. The presence or absence of X chromosomes can lead to different variations and disorders, but it is the Y chromosome that ultimately determines maleness.

Considering That Males Can Have Klinefelter (XXY)syndrome,XYY,and Normal XY Chromosomal