FRHD 2100 Chapter Notes - Chapter 10: Gamete Intrafallopian Transfer, In Vitro Fertilisation, Fallopian Tube

• School: University of Guelph
• Department: Family Relations and Human Development
• Course: FRHD 2100
• Professor: Tuuli Kukkonen

Document Summary

Conception is the union of a sperm cell and an ovum. Sperm that bear y chromosomes appear to be faster swimmers than those bearing x chromosomes. One of the reasons 120 to 150 boys are conceived for every 100 girls. Male fetuses are more likely to be lost in spontaneous abortions which often occur during the. Boys still outnumber girls at birth but boys suffer a higher incidence of infant mortality. Millions of sperm deposited in the vagina simply ow out of the women body because of gravity and vaginal acidity kills many. Surviving sperm may reach the fallopian tubes 60 to 90 minutes after ejaculation, about half end up in the wrong tube. Ova secrete a chemical that attracts sperm, because sperm have odour receptors its conceivable that sperm are attracted to ova through a variation of the sense of smell. Fertilization normally occurs in the fallopian tubes. Zona pellucida: a gelatinous layer that surrounds an ovum.