What will you look for to identify the sex of the following?
Correct answer: D. Male shark - claspers borne on pelvic fins
- A. Female Ascaris - sharply curved posterior end
- B. Male frog - a copulatory pad on the first digit of the hind limb
- C. Female cockroach - anal cerci
- D. Male shark - claspers borne on pelvic fins
Explanation
Tail end is straight in female Ascaris, while tail end is curved towards ventral in male Ascaris. Anal cerci is present in both male and female cockroach, while anal style is present only in the male cockroach. The forelimbs in both frogs (male and female) bear small articular pads dorsally at the joints of digit, but the males possess a special nuptial, copulatory pad on ventral side of the first finger of each forelimb. Copulatory pads appear merely as rough patches, but during breeding season, they become thick and sticky. In copulation, the male strongly grips a female under her armpits by means of these pads. Claspers are modified inner edges of pelvic fins in male sharks.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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