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What will you look for to identify the sex of the following?
A
Male shark – Claspers borne on pelvic fins
B
Female $Ascaris$ – Sharply curved posterior end
C
Male frog – A copulatory pad on the first digit of the hind limb
D
Female cockroach – Anal cerci
Detailed Solution
In cartilaginous fishes the males have claspers on the pelvic fins, used to transfer sperm; so a male shark is identified by its claspers. This is correct.
In $Ascaris$ it is the male that is smaller and has a curved posterior end; the female is longer with a straight posterior end.
The male frog has a copulatory pad on the first digit of the fore limbs, not the hind limbs (and also has vocal sacs).
Anal cerci are present in both male and female cockroaches; the male is identified by the anal styles, which are absent in the female.
Hence the correct identification is male shark – claspers borne on pelvic fins.
In $Ascaris$ it is the male that is smaller and has a curved posterior end; the female is longer with a straight posterior end.
The male frog has a copulatory pad on the first digit of the fore limbs, not the hind limbs (and also has vocal sacs).
Anal cerci are present in both male and female cockroaches; the male is identified by the anal styles, which are absent in the female.
Hence the correct identification is male shark – claspers borne on pelvic fins.