MEDICAL BIOLOGY

the eggs in the process of vertebrate phylogenesis?
the change in

the amount of yolk in the eggs in the process of vertebrate phylogenesis will be fertilization. The phylogeny of a group, in this case back-boned animals (vertebrates), represents the course of evolutionary change undergone by that group over time. It is typically represented in the form of a  dichotomous branching tree in which the vertical axis represents time and the horizontal axis represents closeness of relationship . Fertilization is the fusion of gametes to give rise to a new individual organism or offspring and initiate its development. This cycle of fertilisation and development of new individuals is called sexual reproduction. During double fertilisation in angiosperms the haploid male gamete combines with two haploid polar nuclei to form a triploid primary endosperm nucleus by the process of vegetative fertilisation. Fertilization occurs when a sperm and an egg have fused together to form a zygote, which begins to divide as it moves towards the uterus. of paternal origin, with an egg nucleus, of maternal origin, to form the primary nucleus of an embryo. In all organisms the essence of fertilization is, in fact, the fusion of the hereditary material of two different sex cells, or gametes, each of which carries half the number of chromosomes typical of the species. The most primitive form of fertilization, found in microorganisms and protozoans, consists of an exchange of genetic material between two cells.