Gene A converts compound A (green) to compound B (blue). Gene B converts compound B to compound C (red). These compounds determine the color of the individual. In a cross between a double heterozygote and an all recessive individual, what proportion of green to red offspring should be seen?

The options

a. 3:4

b. 3:1

c. 4:3

d. 4:9

e. 1:3

The CORRECT ANSWER IS e.

e. 1:3

Explanation:

Compound A (green) , GENE A is transformed to Compound B (blue)

Compound B (blue) , GENE B is transformed to Compound C (red)

After gene A as transformed the compund A to compound B, gene B can can transform the compound B to C. Therefore, once gene A is forming blue colour from green, gene B as the capability to form red colour from the blue one.

Lets cross AaBb X AaBb (the product of the cross is shown in the attached image. )

we will have the following genotypes:

AABB-1

AABb- 2

AaBB-2

AaBb-4

We obtain a functional copy of A and B gene from the cross. Thus, the transformation of colour will proceed from green to red and they will form red colour, giving us 9 red colour.

AA bb -1

Aa bb -2

The functional B gene is absent in these organism while the funtional A gene can be seen, thus only blue colour will be formed or 3 individual will give the blue colour.

aa BB -1

aa Bb -2

aa bb-1

these set of individual will not give or form any colour as they do not possess the functional A gene which is a requirement for starting the cascade of transforming the compounds.

Therefore, the blue to red offspring will be

3:9 or 1:3

The CORRECT ANSWER is e.

not sure if this what   you'r looking for would be percent composition

ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'