Question

The zygote develops into a multicellular well organised organism is called
i) Ontogeny (ii) Phylogeny (iii) Growth (iv) Development​

Answer 1

Answer:

(iv) Development​

Explanation:

Developmental biology or embryology is the study of all the sequential orderly processes of development which involves a series of steps from gametogenesis to growth and differentiation.

Developmental biology deals with all aspects of the entire developmental period of the individual organism while embryology deals with the study of embryonic life only.

Answer 2

The zygote develops into a multicellular well organised organism is called (iv)Development

Explanation:

The study of all the sequential ordered processes of development, which includes a sequence of steps from gametogenesis to growth and differentiation, is known as developmental biology or embryology.

Ontogeny:

• Ontogeny is the process through which an organism develops (both physically and psychologically, for example, moral development), usually from the time of fertilisation to adulthood.
• The phrase can also be used to describe the study of an organism's complete lifecycle.

Phylogeny:

• The evolutionary history of a species is referred to as phylogeny. The study of phylogenies—that is, the study of species' evolutionary relationships—is referred to as phylogenetics.
• The sequence of a common gene or protein can be utilised to determine the evolutionary relationship of species in molecular phylogenetic analysis.

Growth:

• The zygote develops into a compact clump of cells. The blastocyst is then formed, which is a hollow ball of cells.
• The blastocyst implants in the uterine wall, where it grows into an embryo connected to a placenta and surrounded by fluid-filled membranes.

Development:

• A zygote is a fertilised egg cell produced by the union of a female gamete (egg, or ovum) and a male gamete (sperm) .
• The zygote stage of human and other animal embryonic development is brief, followed by cleavage, when the single cell is subdivided into smaller cells.