Biodiversity is essential in medicine as most active chemicals used to make medicines are derived from plants or other organisms. Climate change today threatens species that are vital to medicine. An example would be coral reefs. Studies have been done on reefs that look at fighting cancers, HIV and other ailments. One of the richest zones of biodiversity is the tropics and this region is under threat from global warming and deforestation. It is important to preserve these species for use in future medicinal research. <span />
Competition is the answer
Nervous system for an animal is the part of an animal's body that coordinates its behavior and transmits signals between different body areas.The sensory system relies on specialized sensory receptor cells that transduce external stimuli into changes in membrane potentials.
Answer:
Population density is the number of individuals per unit geographic area, for example, number per square meter, per hectare, or per square kilometer.
Explanation:
The population density of organisms determines how successful they will be and what effects they will have on their environment. In biology, populations are a group of individuals belonging to the same species that live in the same region at the same time.
Answer:
Some of the advantages of allopolyploidy over autopolyploidy are:
1. Allopolyploids generate a different set of gametes due to allelic diversity as they originate from distinct parental species. On the other hand, autopolyploids do not generate different sets of gametes as they originate from similar parental species.
2. Allopolyploids demonstrate heterozygosity, while autopolyploids show homozygosity.
3. Asexual reproduction of allopolyploids is more effective in comparison to diploid selfing as they possess gene diversity, while selfing in autopolyploids is not as effective as they comprise alleles, which are copies of each other.
Some of the disadvantages of allopolyploids over autopolyploids are as follows:
1. The hybrids of allopolyploidy are generally sterile, for example, mule produced by the mating of female horse with male donkeys. On the other hand, autopolyploidy exhibit homozygosity so their hybrid is generally fertile.
2. Allopolyploidy generates unbalanced number of chromosomes in the zygote like in triploid conditions that may be lethal. While autopolyploidy takes place because of genome duplication, thus, chromosome numbers are balanced.