Which of the following statements is true according to the dominant-recessive genes principle?
A)A recessive gene exerts its influence only if both genes of a pair are recessive.
B)Genotype of an individual changes according to the changes in the individual's phenotype.
C)In a gene pair,the dominant gene helps the recessive gene express its instructions.
D)A genotype is an individual's observable characteristics.

Question

Quizplus · Accepted Answer

According to the dominant-recessive genes principle, a recessive gene exerts its influence only if both genes of a pair are recessive. In other words, if an individual has one dominant gene and one recessive gene, only the dominant gene will dictate the trait expressed. The recessive gene will only be expressed if both genes in the pair are recessive. Genotype refers to an individual's genetic makeup, while phenotype refers to their observable characteristics. Therefore, D is incorrect as genotype cannot change according to phenotype. C is also incorrect as the dominant gene does not help the recessive gene express its instructions, it simply masks the recessive gene's traits.

Which of the Following Statements Is True According to the Dominant-Recessive