In yeast, one haploid strain is unable to synthesize uracil but able to synthesize leucine, while
another haploid strain is able to synthesize uracil but not leucine. You think that the two genes
occurring on different chromosomes permit synthesis of uracil and leucine. Your goal is to
determine if the two genes occur on two different chromosomes (not just one chromosome).

a. Provide symbols to represent the genes and alleles you predict determine the variation
observed.
b. Predict the genotypes of the two haploid strains.
c. Briefly describe a procedure you could use to determine whether the two genes occur on
different chromosomes.
d. What specific outcomes (observations) from the procedure you described in c would show
that there are two genes occurring on two different chromosomes? On the same
chromosome?

The two genes are come from one chromosome.

Explanation:

a. One haploid can synthesize uracil, another one can synthesized leucine. Assume that there is not any mutation, two different amino acids should be encoded by different genes.

b. The genotypes of two haploid strains are different. Each has contained single chromosomes, as same as gametes in any Eukaryotic organism.

c. Firstly, yeast is an Eukaryotic organism, diploid. It means they have chromosomes in pair. Secondly, haploid cell contains half of the chromosomes from parent cell. Due to the theory of meiosis, the half chromosome encoding leucine go to one haploid cell, the other encoding uracil go to another haploid cell. If they are from different chromosomes, there is a chance to have a haploid which can produce both uracil and leucine. Thus, the only possible answer is that they are from a chromosome in opposite long-arm or short-arm of the chromosome, which is later divided into two haploid.

d. There is not any haploid strain which is able to produce both uracil and leucine.

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."    

answer: decrease

a limiting factor is the one which decrease the abundance, distribution and causes extinction of the population of species in a ecosystem. here, predators including hawks, owls and snakes are the limiting factor for the population of mexican free tailed bat.   although bats are nocturnal animals as they forge for food at night these predators also may remain active during night which can decrease the population of the mexican free-tailed bats. also, these bats eat only one type of insects that are moths. the food can also be a limiting factor as all 400 members are dependent upon same type of food needs that are moths. the decrease in the moth population can cause decrease in population size of the mexican free-tailed bats.

therefore, the scenarios will most likely to decrease the population size of the mexican free-tailed bats.