Final answer:
The most common result of gamete trisomy is Trisomy 21, or Down Syndrome. Individuals with Down Syndrome have characteristic physical features and developmental delays. The incidence of Down Syndrome is correlated with maternal age.
Step-by-step explanation:
The most common result of gamete trisomy, when that gamete is used to form a zygote, is the condition called Trisomy 21, also known as Down Syndrome. Trisomy 21 occurs when there is an extra copy of chromosome 21 in the zygote. It is the most common trisomy in viable births, occurring in more than 1% of pregnancies.
Individuals with Down Syndrome have characteristic physical features such as short stature, stunted digits, and a broad skull and large tongue. They also experience significant developmental delays. The incidence of Down Syndrome is correlated with maternal age, with older women being more likely to give birth to children with the trisomy 21 genotype.