Numerical Chromosomal Abnormalities

Trisomy Zygote

POLYPLOIDY is the addition of extra haploid sets of chromosomes i.e., 23 to the normal diploid set of chromosomes i.e., 46 . A. Triploidy is a condition in which cells contain 69 chromosomes. It results in spontaneous abortion of the conceptus or only brief survival of the liveborn infant after birth. Triploidy occurs as a result of either a failure of meiosis in a germ cell e.g., fertilization of a diploid egg by a haploid sperm or dispermy two sperm that fertilize one egg . B. Tetraploidy...