Ques 7. The biochemical pathway for seed color is shown below. Symbols W, x, Y,

Question

Ques 7. The biochemical pathway for seed color is shown below. Symbols W, x, Y, and Z represents chemical substances in the pathway which have the potential to affect seed color if they accumulate in cells. Normal green seeds are produced when all substances are eventually transformed into substance Z The genes A, B, and C The A, B, and C alleles code for functional enzymes, while the a, b, and c alleles code for nonfunctiona (and their all eles) code for proteins involved in catalyzing the reactions shown. nzymes. Alleles A, B, and C are completely dominant to alleles a, b, and c enz A enz B enz C clear white yellow green 7. Individuals of genotype CC produce gre en seed and individuals of genotype cc produce yellow seed. When CC and cc individuals are crossed Fl offspring are green. Which of the following is true? a) the C re green. and c alleles have identical nucleotide sequences b) the C and c alleles code for identical mRNA sequences c) the proteins that result from the mRNA sequences coded by the C and c alleles have identical amino acid sequences d) all of the above e) none of the above

Explanation / Answer

7. The alleles C and c are dominant and recessives alleles of the same gene. This gene codes for the enzyme C (enzC) which converts compound Y to compound Z.

The C allele is the dominant allele while c is the recessive allele. Recessive cc is homozygous recessive and will produce a mutated version of enzyC that cannot convert Y to Z. CC is the homozygous dominant, producing wild type or a functional enzC.

The dominant and recessive alleles differ in nucleotide sequences. Hence, mRNA produced and consequently the amino acid sequences differ in homozygous dominant and homozygous recessive plants. In a heterozygous individual, as C is dominant over c, the protein formed will be from a mRNA obtained from C allele.

Hence, right option is e. none of the above.

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