Sunday, March 11, 2012

Comparison between male rat and female rat



Male rat
Female rat
1.        Larger in size
Smaller in size
2.        Nipples are degenerate
6 pairs, fully functional, 3 pairs in thorax and 3 pairs in abdomen
3.        Scrotal sacs present
Absent
4.        Penis present
Absent
5.        Vulva absent
Present
6.        Urethral opening at the tip of the penis is common opening for the passage of the sperms and urine
Separate opening in front of vulva


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