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%

Question

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%

Quizplus · Accepted Answer

Fish are more closely related to humans than yeast, but less so than mammals like mice. Therefore, a reasonable prediction for the orthology percentage of fish genes to human genes would be closer to mammals than yeast, making 80% a valid estimate.

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