There are multiple characteristic that all dinosaurs shared. Some of the synapomorphies include:
- Vertebrates; skeletons with back bones that surrounds a nerve cord.
- Amniotes; specially adapted for life on dry land.
- Diapsids; two holes located above and behind the eye sockets on each side of the skull.
- Archosaurs; antrobital ferestra, a hole between the nasal hole and the eye socket hole.
But still all of this doesn't separate them from all others, what is unique to them is that all of the 'true dinosaurs' were land dwellers.
DNA is the material that makes up genes.
The term DNA means Deoxyribonucleic acid. It has been found to be the hereditary material that is found in genes.
DNA is comprised of a double helix of complimentary amino acids arranged in specific sequences.
These specific arrangements of amino acids encode genetic information found in genes. This genetic information is replicated during cell division.
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Let's work this out with a punnett square:
So if we have a white eye female and this trait is sex-linked, what will be her genotype?
Since the male is red-eyed and this trait is sex-linked, what will be his genotype?
After that, we can set up the punnett square together
