Question 1201452
.


From this source:  https://en.wikipedia.org/wiki/Genus_(mathematics)


<pre>
    In mathematics, genus (plural genera) has a few different, but closely related, meanings. 
    Intuitively, the genus is the number of "holes" of a surface. A sphere has genus 0, while a torus has genus 1.
</pre>


If your question has different meaning, then take a labor to decipher it . . .