Question

What is sexual dimorphism? Give comparison of sexual dimorphism of frog.

Answer 1

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Sexual dichromatism, a form of sexual dimorphism in which males and females differ in colour, is widespread in animals and is most commonly studied in birds ,fishes and butterflies . In The descent of man , Darwin highlighted the strong association between sexually dimorphic traits and related courtship behaviours, thus setting the stage for sexual selection as a primary evolutionary mechanism for sexual dimorphism. In frogs and toads (anurans), the most common form of sexual dimorphism is body size and these differences are attributed to fecundity or sexual selection. Prior to this study, sexual dichromatism was only known from 25 species of frogs . Although we have now documented sexual dichromatism in over 120 species, both its function and evolution remain poorly understood.

In this review we:
(i) document the distribution and diversity of sexual dichromatism in frogs;
(ii) test whether the phylogenetic distribution of sexual dichromatism reflects shared evolutionary history;
(iii) identify circumstances in which sexual selection versus other selective mechanisms may be involved in maintaining sexual dichromatism; and
(iv) outline areas of future research related to the evolution and function of sexual dichromatism in frogs.

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Answer 2

Answer:

Sexual Dimorphism:

• There are some differences in external characters by which male and female can be distinguished.

1. Frogs exhibit sexual dimorphism.
2. Male croak loudly as they have vocal sacs which are absent in females.
3. Males have swollen copulatory pads on inner fingers of forelimbs which are especially developed in breeding season for grasping the female during mating