Appearance of ancestral characters in the newborn, such as tail, monstral face, gill slits, multiple mammae etc. are known as__________.
Appearance of ancestral characters in the newborn, such as tail, monstral face, gill slits, multiple mammae etc. are known as__________.
The correct option is C Atavism
The reappearance of a trait (a specific characteristic of an organism) that had been lost during evolution is called atavism. Examples include power of moving pinna, greatly developed canine teeth, child born with tail, presence of gill slit etc. Hence option c is correct.
Figure : child born with tail
Homologous organs are defined as organs of different animals which have similar structure but different functions. Example include forelimbs of whales, bats, cheetah and humans. Though these perform different functions, they have similar anatomical structures. Their forelimbs consist of humerus, radius, ulna, carpals, metacarpals and phalanges. So option a is incorrect.
Figure : Homologous organs
Analogous organs are the organs of different animals which have different structures but perform similar functions. Examples include fins in fishes and flippers in penguins. Hence option b is incorrect.
Figure : Analogous organs
Organs which are present in reduced form and do not perform any function in the body but correspond to fully developed functional organs of related animals are called vestigial organs.
Examples include vermiform appendix. Hence option d is incorrect.
Figure : Vermiform appendix
The reappearance of a trait (a specific characteristic of an organism) that had been lost during evolution is called atavism. Examples include power of moving pinna, greatly developed canine teeth, child born with tail, presence of gill slit etc. Hence option c is correct.
Figure : child born with tail
Homologous organs are defined as organs of different animals which have similar structure but different functions. Example include forelimbs of whales, bats, cheetah and humans. Though these perform different functions, they have similar anatomical structures. Their forelimbs consist of humerus, radius, ulna, carpals, metacarpals and phalanges. So option a is incorrect.
Figure : Homologous organs
Analogous organs are the organs of different animals which have different structures but perform similar functions. Examples include fins in fishes and flippers in penguins. Hence option b is incorrect.
Figure : Analogous organs
Organs which are present in reduced form and do not perform any function in the body but correspond to fully developed functional organs of related animals are called vestigial organs.
Examples include vermiform appendix. Hence option d is incorrect.
Figure : Vermiform appendix
