The Following Questions Refer to the Information Below -If the Genes of Yeast Are 50% Orthologous to Those

Multiple Choice

The following questions refer to the information below.
A researcher compared the nucleotide sequences of a homologous gene from five different species of mammals with the homologous human gene. The sequence homology between each species' version of the gene and the human gene is presented as a percentage of similarity.
$$\begin{array} { l c } \text { Species } & \text { Percentage } \\\hline \text { Chimpanzee } & 99.7 \\\text { Orangutan } & 98.6 \\\text { Baboon } & 97.2 \\\text { Rhesus Monkey } & 96.9 \\\text { Rabbit } & 93.7\end{array}$$

-If the genes of yeast are 50% orthologous to those of humans, and if the genes of mice are 99% orthologous to those of humans, then what percentage of the genes of fish might one validly predict to be orthologous to the genes of humans?

A) 10%
B) 30%
C) 40%
D) 50%
E) 80%