QUESTION 7 I have a corn kernel with the genotype C Ct at the pigment locus (dip
ID: 208916 • Letter: Q
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QUESTION 7 I have a corn kernel with the genotype C Ct at the pigment locus (diploid, so it has two alleles per locus, and this individual has C allele and Ct allele). C produces purple pigments, c does not produces pigments, and Ct is the allele C (pigmented) but Ds get inserted in the gene. Ds is a non-autonomous transposable element and Ac (activator) is an autonomous element. When Ac exists in the genome, I call it Ac+, and when Ac doesn't exist in the genome, I use Ac- Remember, you only need one functional pigment gene to have purple color. What color is the kernel with Ac- C Ct? yellow O purple spotted or red can't tell QUESTION 8 I have a corn kernel with genotype Ac- Ct Ct, what color is it? yellow purple spotted can't tellExplanation / Answer
7. Non-autonomous transposable elements are those transposable elements in maize that cannot transpose by themselves unless activator elements are present in the genome. The given genotype is Ac- C Ct, which means C is purple colored allele, Ct means the allele is pigmented but it has Ds (transposable elements) inserted in the gene. These Ds cannot be excised as there are no activator elements (Ac-) in the gene. As the genotype has C allele, and C is dominant even though Ct is present at the second allele locus, the color of kernel will be purple. So, the correct option is option B, purple.
8. The given genotype is Ac- Ct Ct. Ct means the allele is pigmented but it has Ds (transposable elements) inserted in the gene. These Ds cannot be excised as there are no activator elements (Ac-) in the gene. Since Ds cannot be excised they cannot express purple pigment. As the genotype has both Ct alleles, purple pigment cannot be expressed. The color of kernel will be yellow. So, the correct option is option A, yellow.
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