Question

GENETICS

5. Two genetically identical organisms express slightly different phenotypes for a given trait when raised in different environments. This is an indication that a environmental components have a large effect on the expression of the phenotype. b. this phenotype is not multifactorial. the trait is determined by a single gene. d. the environment is equally important to the phenotype as the genotype. Se the phenotype is multifactorial but the genotype strongly influences the phenotype. (5 marks)

can somebody tell me why b,c,d and e are incorrect please

Answer 1

ANSWER:

in the given question opton 'a' is the corect answer. the other are incorrect because:-

• in option 'b' it says that this phenotype is not multifactorial but the question signifies phenotypic changes due to different environment which occurs when the trait is multifactorial. Traits are said to be multifactorial if multiple genes as well as multiple environmental factors influence them hence, multifactorial inheritance is responsible for most phenotypic differences.
• in option 'c' it is said that the trait is determined by a single gene but a trait can be determined by a single gene or a number of genes but this does not tells us if there will be effect on phenotype og oranism if it is kept in different environment.
• in option 'd', we can say that many environmental factors are important for the phenotype of an organism like temperature,pressure etc. but for them to change the phenotype of an individual there effect must be large and significant which is more clearly explained in option 'a'.
• for option 'e' , the genotype does affects an individual phenotype and the degree to which it is affected is termed as 'phenotypic plasticity'. However, environmental factors influence our phenotypes throughout our lives, and it is this on-going interplay which affects an individual's phenotype whwn kept in different environment in their lives as environmental factors tend to work on them.

Hence, these reasons tells us why option 'a' is the correct answer.