child psyc test2

Each human reprodcutive cell or gamete contains?

23 Chromosomes

when conception occurs 2 cells form?

a zygote

a zygote contains

23 chromosomes

the 46th chromosome dictates

the organisims genetic inheritence or genotype.

the 23 chromosome determines

the sex xx xy


observable characteristics, appearance, personality,intelligene


a persons gentic inheritance

dizygotic twin

fraternal, have 1/2 genes in common

monozygotic twins

identical, rare origanate from one zygote, genotype the same

down syndrome

47 chromosomes instead of 46