How is a covalent bond formed between atoms?
the atoms share electrons.
additional neutrons are added to the atomic nuclei.
one atom gives electrons to another.
extra electrons are removed from the atoms.

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

The human genome project is devoted to mapping the general dna sequence of our species. this could lead to the development of new medicines, as well as the possibility of using gene therapy to treat certain diseases. however, there are some ethical issues surrounding the mapping of individual genomes. one concern is a) that your genes may change over time, making the project useless. b) that insurance companies could discriminate based on genetic make-up. c) that since this has never been done before, we should probably not do it now. d) that sequencing our individual genomes is so expensive, it is a counter-productive strategy.

What is the difference between how ionic and covalent bonds form