AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

GENE MUTATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following would be a beneficial effect of a mutation?
A
a weakened immune system which prevents you from fighting off illness
B
improved resistance to drought conditions in corn plants
C
having a finger that is double-jointed
D
having blue eyes
Explanation: 

Detailed explanation-1: -Among the most common of these practices are conservation tillage and irrigation, which are widely used in the western Corn Belt. Minimal disturbance of soils through tillage-such as through conservation tillage-makes more water available to the crop by reducing evaporation.

Detailed explanation-2: -Drought resistance or tolerance is a broader term applied to plant species with adaptive features that enable them to escape, avoid, or tolerate drought stress (Levitt, 1980). Drought escape is the capability of the plant to complete its life cycle before onset of drought stress.

Detailed explanation-3: -Drought resistant crops are produced by genetic engineering. The genetic engineers isolate the gene of other natural drought resistant plants and this is inserted into the crop to make it drought resistant.

Detailed explanation-4: -A gene encoding galactinol synthase (GolS), a key enzyme involved in raffinose family oligosaccharide biosynthesis, was introduced to improve drought-stress tolerance in transgenic Arabidopsis (Taji et al., 2002). Prior analyses demonstrate that GolS genes are induced by drought, cold, and ABA.

There is 1 question to complete.