Answer:
The stem cells are the special cells that can develop into different types of specialized cells. There are two major stem cells in the body. The one is an embryonic stem cell that presents in the initial divided few cells that have the ability to develop into any type of specialized cells.
The other one is adult stem cells such as Bone marrow that contains two types of stem cells: hemopoietic which has the ability to produce all three types of cells, and stromal that able to produce special muscles and bones due to their limited ability to develop specialized cells or multipotent.
Thus, embryonic stem cells are more useful than adult stem cells.
Outermost<span> valence </span>shell<span> determines the reactivity of a given element. When an atom or ion has only full </span>electron shells<span>, it is less chemically reactive; that is, it is less prone to form covalent bonds.</span>
Answer:
There will be no new land for the plant and other organisms or resources.
Explanation:
Answer:
Malaria can be described as a disease which is caused by a parasitic organism. The Anopheles mosquito carries the parasite Plasmodium in it. When this mosquito bites a human being, the parasite gets transferred into the blood of the person causing malaria. Before entering the blood cells, the plasmodium travel to the liver where they get matured.
Malaria is a life-threatening disease which kills many humans each year, especially people living in underdeveloped countries.
Answer:
Alleles are recombined when gametes from different parents join together.
Explanation:
Genetic variation is increased by sexual reproduction in 3 main ways
1. Random mating - individual organisms reproduce with each other at random, meaning new combinations of DNA come together when fertilization occurs
2. Crossing over - during meiosis, when homologous chromosomes align, they can exchange genetic material by a process called crossing over, or homologous recombination. This means the alleles on each homologous chromosome are reshuffled, creating new combinations.
3. Independent assortment - When gametes are formed, a diploid cell duplicates its DNA and forms 4 haploid cells. Each of the homologous pair of chromosomes in the diploid align in the centre of the cell to be split into the gametes at each division. The orientation at which they line up is random, so every gamete gets a different selection of chromosomes (which themselves have been shuffled bt crossing over).
Only the 1st option (Alleles are recombined when gametes from different parents join together.) is correct. This represents the process of random mating, where new combinations of alleles are formed during fertilization between two individuals.