Answer:
Thomas Hunt Morgan demonstrated that
<u>chromosomes carry genetic material in the form of genes. </u>
T. H. Morgan gave the experimental verification of the chromosomal theory of inheritance by Sutton and Boveri.
He along with his colleagues worked with fruit flies (<em>Drosophila melanogaster</em>) which led to discovery of the basis of variation that occured due to sexual reproduction.
Answer:
Cleavage, morula, blastocyst, gastrula
Explanation:
The zygote is formed after fertilization of sperm and ovum. Then the zygote undergoes a repeated cell division to form a number of cells. These tiny cells formed by mitotic cell division but present inside the zygote. It forms 2 cells then 2 cells, then 8 cells and so on. After forming the number of cells the zygote has a number of tiny cells. This stage is called morula and the tiny cells are called morulae. Then these cells migrate towards the periphery of the morula and creating a central space called blastocoel. This hollow ball structure is known as the blastocyst. After this blastocyst stage, the cells migrate to form 3 layers such as endoderm, mesoderm, ectoderm. From this layer different organs are formed. This 3 layered stage is known as gastrula. Thus the zygote development starts from cleavage, morula, blastula, and gastrula.
A- valve replacement
b- stents
x- heart transplant
From what i know, the feet of an animal should always be on the table. This is due to the fact that aside from health reason's, the animal usually feels more comfortable not on it's back.
