AP BIOLOGY

ANIMAL REPRODUCTION AND DEVELOPMENT

ASEXUAL REPRODUCTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Sea stars have the ability to regenerate half their body when attacked by a fish. The remaining half can eventually grow new arms as long as the central disk is attached. Which statement best explains what type of reproduction occurs when sea stars regenerate?
A
Asexual reproduction occurs because each half has a similar structure.
B
Asexual reproduction occurs because each half has the same genetic information.
C
Sexual reproduction occurs because each half has a parent and an offspring.
D
Sexual reproduction occurs because each half has one quarter of the parents’ genetic information.
Explanation: 

Detailed explanation-1: -What confers the starfish’s ability to regenerate? Through stem cells in the animal’s body.

Detailed explanation-2: -Complete answer: Fission is the type of asexual reproduction in which the reproducing organksm breaks into two parts and each part develops into another individual. During fission in a starfish, the central disc of starfish disintegrates into two pieces. Each piece then regenerates into a new Starfish.

Detailed explanation-3: -Asexual reproduction in starfish takes place by fission or through autotomy of arms. In fission, the central disc breaks into two pieces and each portion then regenerates the missing parts.

Detailed explanation-4: -Starfish, or sea stars, are radially symmetrical, star-shaped organisms of the phylum Echinodermata and the class Asteroidea. Aside from their distinguished shape, starfish are most recognized for their remarkable ability to regenerate, or regrow, arms and, in some cases, entire bodies.

Detailed explanation-5: -Starfish exhibit an asexual mode of reproduction through binary fission and regeneration. Starfish is a bisexual organism and undergoes regeneration as a method for asexual reproduction. In binary fission, the parent organism’s cell divides exactly into two genetically identical daughter cells.

There is 1 question to complete.