In genetics, the dash symbol (–) is a “wild card” that stands for either the dominant allele or the recessive allele; for example, a– means the individual has either the genotype aa or aa. two genes that undergo independent assortment affect coat color in the house mouse. each gene has two alleles, one of which is dominant for coat color. genotypes of the form a– b– have a brownish color called agouti, those of the form a– bb are black, and those of the form aa b– and aa bb are albino (white). what ratio of agouti : black : white is expected from the cross aa bb × aa bb?

10 (agouti) : 3 (black) : 3 (white)

Explanation:

Genotype AaBb can produce gametes AB, Ab, aB, ab.

The cross between Aa Bb × Aa Bb:

The phenotype ratio is 10 (agouti) : 3 (black) : 3 (white)

Genotypes for the agouti phenotype are: AABB, AABb, AaBB, AaBb

Genotypes for the black phenotype are: AAbb and Aabb

Genotypes for the white phenotype are: aaBB, aaBb and aabb

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.    

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .