Question

Gastrulation is a large scale rearrangement of embryonic cells that gives rise to the primary germ layers. After gastrulation: Question 13 Not yet answered Points out of 2.50 p Flag question Select one: O a. The blastocoel replaces the archenteron b. The central nervous system induces the underlying notochord from mesoderm C. The notochord develops into the spinal cord and brain O d. Ectoderm forms the outer surface and induces the underlying mesoderm to form the central nervous system O e. The notochord induces the overlying ectoderm to form the central nervous system

Answer 1

Question 13 ) ans : e. the notochord induces the overlying ectoderm to form the central nervous system

explanation - After gastrulation, the notochord—a flexible, rod-shaped body that runs along the back of the embryo—is formed from the mesoderm. During the third week of gestation the notochord sends signals to the overlying ectoderm, inducing it to become neuroectoderm.After gastrulation, the notochord—a flexible, rod-shaped body that runs along the back of the embryo—is formed from the mesoderm. During the third week of gestation the notochord sends signals to the overlying ectoderm, inducing it to become neuroectoderm.

Question 14) ans : d. 14 replicated chromosome /11.6 picogram of DNA

explanation - egg cell of fish have 7 chromosome and 2.8 picogram DNA

  cell of fish have 14 chromosome and 5.6 picogram DNA

the fish undergoing metaphse 1 in meosis have replicated chromosome as replication of chromosome occure in s phase . due to replication amount of DNA get doubled.