You will need to complete a Punnett square to answer this. Let's say tongue rolling is R and non-rollers are r. The heterozygous roller would be Rr and the non-roller would be rr.
Rr x rr
That yields two offspring with Rr (rollers) and two rr (non-rollers). The ratio is 2:2 or 50%. See the attached image for the completed Punnett square.
Wait what please explain I'm so lost
Osteoprogenitor and osteogenic good luck
An abstract is a summary of the most important points in a scientific paper so scientists can keep up to date and know what the scientefic work says with out spending lots of time reading it.
Check out the article below for more information.
Ebert, James R. "WHAT IS AN ABSTRACT." WHAT IS AN ABSTRACT<span>. N.p., n.d. Web. 06 Mar. 2016.</span>