Environmental effects on phenotype Knowledge-Based Download PDF

Questions

1. 1.

   Which of the following observations provides direct evidence that environmental factors can influence an organism's phenotype without altering its genotype?

   • A) Genetically identical hydrangea cuttings develop blue flowers in acidic soil and pink flowers in alkaline soil.
   • B) A point mutation in a structural gene alters an enzyme's active site and reduces its catalytic efficiency.
   • C) Two heterozygous pea plants produce offspring exhibiting a 3:1 ratio of dominant to recessive physical traits.
   • D) A diploid organism expresses only the dominant trait because a recessive allele is masked by a dominant allele.