Tissues and organs / Tissue culture
The zygote is created when an egg and sperm combine during sexual reproduction in humans. Via mitosis, the zygote divides to create an embryo. An embryo is first just a mass of similar cells, but as time goes on, those cells change or differentiate to produce tissues and organs.
Cell differentiation results in increased efficiency since cells are structurally specialized to carry out tasks. Division of work is the term used for this.
Groups of related cells altered for a specific purpose make up a tissue.
Tissues in Plants:
The primary tissue types found in plants include;
Dermal (epidermis, for example).
Vascular, such as xylem and phloem.
Earth (for example, cells in the cortex of a leaf stem).
Cells in a tip that divide through mitosis are called meristematic.
Animal Tissues:
The primary categories of animal tissues are as follows:
Epithelial, such as the skin.
Connective, such as bone or blood.
Cell continuity
There must have been a cell before there was a cell. New cells are created by the division of existing ones. This is the meaning of the term "cell continuity."
Chromosomes and the Genetic material
A genome is an organism's whole genetic makeup.
A cell must transfer the appropriate genetic material to each offspring when it divides. The nucleus of a cell contains the genetic material known as DNA. Chromosomes are the structural units that make up DNA.
In organisms belonging to the same species, the number of chromosomes is the same in every cell. A human body cell, for instance, has 46 chromosomes.
Chromosomes
In the new cell, structures resemble threads.
Made up of proteins and DNA
Possess thousands of genes
The chromosomes uncoil to produce a tangled mass known as chromatin in a non-dividing cell.
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