Even by the God of thy father, who shall help thee; and by the Almighty, who shall bless thee with blessings of heaven above, blessings of the deep that lieth under, blessings of the breasts, and of the womb: Genesis 49:25.
Procreation as we know from biology starts with the Union of the male and female gametes or seeds. That Union leads to conception. The implication of this learning is fixation on the organ-system of reproduction to explain and diagnose disorders and dysfunction. Many have made a fortune as experts in this field while others are employee in such enterprise. Every life starts as a seed, The seed is unit of life.
The Bible different from Biology in the understanding of the concept of fertility and conception. The woman seems to be the most important factor in this process.
Woman is the short form of womb-man; as long as there is à willing woman, conception is possible. I do not undermine Biology but it has already is been deposed by the word of God. How could biology explain the conception of Sarah at old age.
If its not possible, it’s not true; but that’s the foundation of the help of God.

“Through faith also Sara herself received strength to conceive seed, and was delivered of a child when she was past age, because she judged him faithful who had promised.” Hebrews 11:11.
Even Sarah laughed at the idea that she was going to have pleasure at old age. Abraham wondered at the process that will bring about conception. Notwithstandimg, it came to pass because they counted God faithful. Faith in God was their contribution, help was provided from above. It happened without complications and inspite of the complexities.
The most important seed required for conception is the word of God. Faith fertilises the word in the womb of a woman. A child is Born as a result this is the biology of scriptures.
You don’t have to agree with these, but Isaac is the proof. Welcome to stress free conception and childbirth; another Isaac is Born. The word, a woman and Faith is all it takes; take your Isaac, laughter.com.
“And being not weak in faith, he considered not his own body now dead, when he was about an hundred years old, neither yet the deadness of Sara’s womb: He staggered not at the promise of God through unbelief; but was strong in faith, giving glory to God; And being fully persuaded that, what he had promised, he was able also to perform.”Romans 4:19-21.