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Ede4ka [16]
3 years ago
13

ALL BUT ONE is a technique that can be used to prevent agricultural impacts on the Great Lakes waterways. A) Diverting the flow

of waterways to prevent them from coming in contact with agricultural lands. B) Cover crops are used to keep soil on the field during the non-growing season while improving soil health. C) Placed along waterways or drainage ditches, buffer strips can catch and retain sediment and excess nutrients. D) Conservation tillage: this is a practice that maintains a layer of vegetative residue that can help to protect the soil from erosion.
Biology
2 answers:
ollegr [7]3 years ago
4 0
A)  <span>Diverting the flow of waterways to prevent them from coming in contact with agricultural lands.Please don't forget to rate and thank me. Thank you</span>
gizmo_the_mogwai [7]3 years ago
3 0
The answer to the question is A
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Answer:

The phenotypic variance= 2113

The eenvironmenal variance= 644

The genetic variance= 1469

The broad-sense heritability = 0.695

Explanation:

To determine the phenotypic variance, we need to know the calculate the environmental variance and the genetic variance first;

because Phenotypic variance = V(p) such that;

V(p) = V(e) + V(g)                  

where V(e)  =  environmental variance and V(g)   =  genetic variance

Therefore, Environmental variance can be defined as a portion of phenotypic variance due to differences in the environments to which the individuals in a population have been exposed. The total amount of variance observed is dependent on the genetic component, determined by the variation that is inherited.

This implies that V(e)= initial variance which was there in the parents ( i.e  Variance of inbred line 1 = 311  and Variance of inbred line 2 = 333 )

V(e) = (311 + 333) = 644

Genetic Variance simply refer to the variance that occurs or preferrably , that is observed after inbreeding (i.e Variance of F1 = 316  and Variance of F2 = 1153)

V(g)  = (316 + 1153) = 1469

Now, back to phenotypic variance = V(e) + V(g)

substituting the parameters we have;  1469 + 644 = 2113

Broad-sense heritability can be calculated as the ratio of total genetic variance to total phenotypic variance.

= V(g)/ V(p)

= 1469/ 2113

= 0.695

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