This topic gets a bit involved and complex and apologies I haven't time here to go into further and essential details, but some essential skim the top points anyway.
The Hebrew Holy Book, Torah, contains what is the first five books of the Old Testament of the Christian Bible. Accounts go that about 2000 BC when Abram made his pact with YHWH, and became Abraham, resulting in the Hebrew/Jewish "Chosen People", much of their legacy was oral tradition and only became written after the time of their captivity by the Babylonians, exposure to that culture and it's written records, and these in slightly altered form would be the start of written accounts by the Hebrews/Jews; the Torah and portions later of the Old Testament;
EXCERPT;
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Torah (
/ˈtɔːrə, ˈtoʊrə/;
Hebrew: תּוֹרָה, "Instruction", "Teaching" or "Law") has a range of meanings. It can most specifically mean the first five books (
Pentateuch or
Five Books of Moses) of the
Hebrew Bible, namely (in their commonly used names) Genesis, Exodus, Leviticus, Numbers and Deuteronomy. This is known in the Jewish tradition as the
Written Torah.
It can also mean the continued narrative from all the 24 books, from the
Book of Genesis to the end of the
Tanakh (
Chronicles). If in
bound book form, it is called
Chumash, and is usually printed with the
rabbinic commentaries (
perushim). If meant for liturgic purposes, it takes the form of a Torah scroll (
Sefer Torah), which contains strictly the five books of
Moses.
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en.wikipedia.org
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From the Sumer~Akkad~Babylon culture the Hebrews/Jews acquired the basis of their scripture, a variation of that Mesopotamian cultural lineage, and what in Hebrew is called Nephilim was to the Sumers, etc. the Anunnaki. One literal translation being "Those from Heaven (Anun) came to (na) Earth(ki)". Hint being we are talking about being come down from the sky to Earth, or what might be seen now as non-terrestrial(NT) or extra-terrestrial(ET) beings.
en.wikipedia.org
When we consider if the Torah/OT Genesis is to be taken with any degree of truth or accuracy, allowing for limits of language and terms such that distant and low technology era and it's concepts and language had to express with, then the implication of Genesis, chapter six, verses 1-6 about the "sons of the gods"(plural in both case in original Hebrew) mating (sexual relations) with the "daughters of man" and having offspring of such coitus, then the genetic/DNA nature of both have to be closely enough related in genes and chromosome structure for sperm and egg to join.
While humans reportedly share about 98-99% common genes/DNA with our closest animal relatives, the simians/apes: chimps, gorillas, orangutans; the simian DNA is arranged in two matching strands of 24 chromosomes each, while humans have 23 chromosomes. In humans, two of the ape chromos have merged into a single, longer chromo and this would have to be the case with the NT/ET "sons of the gawds" if their coitus with human females were to produce offspring, especially ones that would also be able to reproduce via further coitus with either "gods" or humans.
Yes there is a whole huge "can of worms" implications here which complicates both the Creationist Dogma (which may have been planted with humans via those Anunnaki) and the position of the Secular/Science Evolutionists. Neither is likely to enjoy the concept of outside Intervention with natural evolutionary process here on Earth by non-Earthly beings to make reproduction with an indigenous but hybrid species possible.
As if that weren't enough of a difficult pill to digest, the back story may be further complicated via other inter-stellar events of the distant past, what I have developed into the "Geminga Scenario" which will have to wait for a later time when I have the time and energy to present.
Bottom line is that not only is there more to the story of the "Nephilim", but even more disturbing a story to human species origin and that of our starting civilizations which neither pole/extreme of conventional history, theology, and/or academics wants to acknowledge or deal with.
More later ....