Question

how do the basic tissues of an embryo form

Answer 1

Embryogenesis my friend is quite a proccess

in Embryogenesis is a science on its own and blossomed int the 21st century during the use of the drug thalidomide which caused phocoamelia and amelia in kids at some time is scientific history

now the first (3-8) after fertilization is known as embryogenesis and this period is very important because this is the time when the embryo is most susceptible to birth defects.

now is the embryo formed it is formed from

PGCs which means primodial germ cells which give rise to the male and female gametes
Male gamete(spermatozoon) + female gamete(oocyte) = embryo
these primodial germ cells migrate to the yolk sac then to the gonads

now when cell division occurs it starts by meiosis of the male gamete to give rise to a haploid number of cells and as well as the female

then these two haploid number of cells combine to rise back to diploid number WHICH IS THE BIG YOU NOW ASKING THIS QUESTION

now after this a series of developments start to occur.the oocytes would develope producing hormones in order to maintain the pregnancy

the embryos organs start to develope and i am sure by the 8th week the heart is the first organ to develope.

it is good i remember that organisms are made up of cells according to the cell theory and as you can see i can safely say that embryos tissues develope from PGCs

the rest of the development is from the (8-38) week which is known as the fetal period which means the fetus now and not the embryo and that is a long proccess because there is a lot of anatomy there.

Answer 2

you know how this occurs men produce sperm and women ovulate and then sperm swim to meet the sperm and then you know the BIG YOU is produced.