In fruit flies, an autosomal mutation in the gene for wing veining results in cross veinless wings. this mutation is recessive. at another gene, an autosomal recessive mutation results in white eyes. which of the following indicates the genotype of an individual heterozygous at both loci?
a. cv+cv w+ w
b. cv+cv w+w
c. v+v r+ r
d. v+v r+r

B. cv+cv w+w

Explanation:

Fruit flies have a special nomenclature to write the genotype of individuals.

In this problem, both crossveinless (cv) and white (w) mutations are recessive.

For that reason, a heterozygous individual's genotype for both genes will be written as:

the fossil record provides evidence of a common ancestor to many species.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.