<span>Human skin color is a polygenic trait, which means that multiple gene loci (with different alleles) are involved in its expression. It has been shown that there more than 350 genetic loci involved in determining skin color. Because of that, there is the enormous number of possible genotypes for the skin color and as a result, the phenotypes vary from the darkest brown to the lightest hues.</span> <span> Different populations have different allele frequencies of genes for human skin color, and the combination of these allele variations brings about complex and continuous variation in skin coloration. Natural skin color can change due to exposure to sunlight (becomes darker) and that is the way it adapts to intense sunlight irradiation (protection against the UV exposure).</span>
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Ans. (A).one species would be force to leave.
A niche is defined as a specific area, where an organism lives and interacts with all the abiotic and biotic factors that affect it.
Two organisms cannot survive in the exactly same habitat as they will compete for same resources, so one will die). Hence, one of the two competing species gets evolved to use a different niche and uses different sources. This is known as resources partitioning and helps the organisms to coexist by reducing competition between them.
Thus, the correct answer is option (A).
Answer:
Nitrogen
Explanation:
The air in the atmosphere is made out of 78% Nitrogen, 21% oxygen, and 1% other gases.
Answer:
The genes need to be on different chromosomes.
Explanation:
In the first cross, the ratios are equal at 25 percent but for the offspring, there is no balance. These results can be caused by the gene that is observed being on the same chromosomes, in which case it's effects will not be observable in the offspring.
I hope this answer helps.
