In Drosophila, the gene for red eyes, R is dominant to the allele for white eyes , r. This is sex-linked . Determine the possible genotype and phenotype ratios expected from a cross between:

B) XRxr XrY

XRXr,XRY,XrXr,XrY

Genotype ratio:1:1:1:1

Phenotype ratio: 2:2 50% white, 50% red

C) XRXR, XrY

XRXr,XRY,XRXr,XRY

Genotype: 2:2

Phenotype: 100% white

D) XRXR,XRY

XRXR,XRXR,XRY,XRY

Genotype: 2:2

Phenotype: 100% white

xcvzcxvxzv

explanation:

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."