The diploid state of a cell provides a simple explanation for why that cell contains a. one gene for each trait b. two genes for each trait c. three genes for each trait d. four genes for each trait

Two genes for each trait

Explanation:

All the traits of an individual, whether they are physical, behavioral or physiological, they are controlled by genes which are the unit of inheritance.

Each character of an organism is encoded by a specific gene, but because organisms are composed of diploid cells, this means that each gene is present in two copies. These two copies of genes are commonly termed as alleles because they are alternative form of genes.

For example: eye color of a person is blue because he has two genes for eye colors, one from his father and one from his mother, but blue form of the gene was dominant on other color gene, therefore that person has blue eyes.

Same goes for each and every trait of an organism. The genes are two in number although gametes get only one of them.

Note: As we know alleles are alternative form of genes but to keep answer and explanation simple, we used the same term gene for allele because in actual both are same.

Hope it help!

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!