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  • The following is a hypothetical pathway for the development of wild type (red) eye color in an insect: W (colorless precursor)                 &nbs

The following is a hypothetical pathway for the development of wild type (red) eye color in an insect:

W (colorless precursor)                               Y (colorless precursor)
        \downarrow  Enzyme A                                             \downarrow Enzyme B

X (Orange pigment)              +             z (Brown pigment)
                                               \downarrow
                                       Red eye color
                                        (wild type)
Enzymes A and B are encoded by the genes a+ and b+, respectively.

The following statements are made regarding inheritance of the genes involved in the development of eye color:

P. when two heterozygous individuals of the genotype a+ ab+ b are mated, progenies with red, orange, brown and white eye color will be observed irrespective of whether the genes are independently assorting or showing incomplete linkage.

Q. when two heterozygous individuals of the genotype a+ ab+ b are mated, progenies with red, orange, brown and white eye color will be observed in a ratio of 9:3:3:1, when the genes are independently assorting.

R. when a heterozygous individual of the genotype a+ b/a b+ is test crossed, progenies with red and white eye color will be more in number.

S. when a heterozygous individual of the genotype a+ b/a b+ is test crossed, progenies with orange and brown eye color will be more in number.

Which of the above statements is true?

 

 

 

 

 

Option: 1

 Pand R


Option: 2

Q and R


Option: 3

P, Qand R

 


Option: 4

P, Q and S

 


Answers (1)

best_answer

When a heterozygous individual of the genotype a+ b/a b+ is test crossed, progenies with red and white eye color will be less in number.  Therefore, statement R is incorrect. 

Hence, the correct answer is option 4. 

 

Posted by

Nehul

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