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:

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion