Answer:
We know the gametes contain n number of chromosomes and the union of two gametes egg and sperm result in the formation of zygote which contains 2n chromosomes.
Given the situation, If an egg cell containing the (n+1) number of chromosomes combined with a sperm cell containing the (n) number of chromosomes, it will result in the formation of a zygote containing (2n + 1) chromosomes, a condition that is known as Trisomic.
Trisomic condition can be of different types like:
- Full Trisomy: in which an entire extra chromosome is present.
- Partial trisomy: In which only a small part of extra chromosome is present.
- Secondary trisomy: In which quadruplicated arms of an extra chromosome are present.
- Tertiary trisomy: In which extra chromosome contains copies of arms from two other chromosomes.
Trisomy is basically a chromosomal aberration condition and if it happens in a human it can cause serious birth defects in children for example: Down syndrome. Here are few diseases that can be caused due to Trisomic conditions of child:
- Trisomy due to addition chromosome 21 (Down syndrome)
- Trisomy due to addition chromosome 18 (Edwards syndrome)
- Trisomydue to addition chromosome 13 (Patau syndrome)
Hope it help!
