I agree, but those recessive genes exist because the 1 in 4 can pass on their gene. Sickle cell exists because the people with the recessive genes had an heterozygote advantage against malaria, lived, reproduced, and passed it down, so the gene presists, because heterozygotes had an advantage then those homozygotes without the recessive gene.
- but homosexuals cannot reproduce (until now),nor do heterozygotes have an advantage and people with recessive genes cannot reproduce, so how did they come about? That mutation should have died out a long time according to Darwin's Natural Selection.
even if the 1 in 4 cannot reproduce and have no advantage that recessive gene can still be passed on by the 2 in 4 who are heterozygous. One such example is cystic fibrosis. Until 50 years back, persons who had the disease (which is a recessive disorder) would die before the age of 10-15, i.e. before they could reproduce. Yet this disease was still present due to the heterozygotes passing on this gene and due to de novo mutations in the gene.