You go on a trip to the Galapagos island to study the animals there for a paper you are writing on evolution, just like Darwin did. You spend 3 days taking blood samples from the tortoises, and then you spend 3 days isolating their chromosomes. What have you recorded? A. Phenotypes B. Genotypes C. Electroencephalogram D. Environmental variation factors

B. Genotypes

Explanation:

The genotype of an organism refers to the genetic makeup of that organism. It is the combination of all the genes contained on the chromosomes of that organism. Gregor Mendel, who is considered to be the Father of Genetics, discovered that certain factors are responsible for the physical characteristics of organisms and that they can be transferred from one generation to another. These factors are called GENES. Genes are located on X-shaped structures called chromosomes.

Hence, the isolation of chromosomes taken from tortoise blood samples refers to recording their GENOTYPE (genetic constituent).

"do a testcross with a homozygous recessive plant."

b. lithosphere, asthenosphere, mesosphere   is the answer most likely