Enabling couples who cannot conceive naturally to have babies via artificial fertilisation is altering human evolution, a leading fertility researcher has claimed. In-vitro fertilisation (IVF) could alter the human genome by allowing defective genes that would normally die with the carrier to be passed onto future generations, according to Dr Hans Hanevik, who leads the fertility department at Norway's Telemark Hospital. Millions of babies born through IVF are likely to carry the genes that caused their parents’ fertility problems, meaning they might also need artificial help to conceive when they are eventually ready to have children.
Men who delay fatherhood should consult their doctor and consider banking sperm before the age of 35, according to researchers at Rutgers University. The study published in the journal Maturitas reviewed 40 years of research of the effect of parental age on fertility, pregnancy and the health of children. It showed that advanced age in men starting a family may a “similar impact” to that of older mothers, affecting the health of female partners and children from declines in testosterone with age, sperm degradation and poorer semen quality.