Question

In a beetle species the red color is dominant over the white color. What is the genotype of any red beetle resulting from this species?
1Points

A

red and white alleles present on one chromosome


B

red and white alleles present on two chromosomes


C

a red allele present on both homologous chromosomes


D

a red allele present on at least one of two homologous chromosomes


Genetic Engineering has led to genetically modified plants that resist insects, pests and bacterial and fungal infections. Which outcome would most likely be a reason why some scientists recommend caution in planting genetically modified plants?


1Points

A

improved agricultural yield and profit


B

increased genetic variation and diversity


C

reduced pesticide and herbicide use


D

unplanned ecosystem interactions

Answer 1

Answer:

D. a red allele present on at least one of two homologous chromosomes;

D. unplanned ecosystem interactions

Explanation:

A dominant allele or trait would always mask the expression of a recessive trait when both are present in a pair. The only way a recessive trait can express itself is when it is in a homozygous state. Since red color is dominant over white color in the beetle species, the genotype of any red color species would have a red alelle present on at least one of two homologous chromosomes. For example, if red allele is represented by R and white allele is r, the genotype of a red nettle species would be RR or Rr.

In the second question concerning the most reason for concern that some scientists recommends caution be taken regarding genetically modified plants is that in the process of introducing new genes into a population, unforseen and unplanned disruption of the ecosystem may occur as a result of interaction with the ecosystem that these process and it's product may present.