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Archy [21]
1 year ago
8

The purple spots on colorless background of corn kernels observed by barbara mcclintock were the result of _______.

Biology
1 answer:
vitfil [10]1 year ago
8 0

The purple spots on the colorless background of corn kernels observed by Barbara McClintock were the result of the transposition of the Ds elements out of the color gene.

<h3>What are the genetic elements found in corn?</h3>
  • A transposable element is removed from one spot in the DNA and inserted into a different site in the DNA during the process of genetic transposition, which allows genes to shift their location on chromosomes.
  • The first recognized genetic instability was caused by genetic transposition.
  • The size of the tissue patch displaying the reversion phenotype increases as a reversion event happens earlier in the kernel development.
  • Barbara McClintock saw purple dots on maize kernels with an otherwise colorless background.
  • These spots were caused by the Ds components of the color gene being transposed.
  • The wild-type (purple) phenotype manifests itself in cells where Ds from the color gene "C" sequence has been lost.

Hence, Barbara McClintock discovered purple patches on the colorless backdrop of maize kernels due to the transposition of the Ds elements out of the color gene.

To learn more about Transposition refer to:

brainly.com/question/13447171

#SPJ4

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Note the two transcribed and translated DNA strips below. The two strips are identical except for a point mutation, where the fi
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Full question attached

Answer/ Explanation:

The original DNA sequence has a point mutation changing a G to a T. The resulting mRNA produced is always complementary to the DNA from which it is synthesised, so the original mRNA sequence has a T, whereas the mutated mRNA has a U. The tRNA is complementary to the mRNA, so the original has a G, and the mutated has a T.

<h3>Original DNA</h3>

GTTGGCGAATGAACGGAGGCTGACGTCTAAGCCTAGAAAAATTGG

RNA

CAACCGCUUACUUGCCUCCGACUGCAGAUUCGGAUCUUUUUAACC

tRNA

GUUGGCGAAUGAACGGAGGCUGACGUCUAAGCCUAGAAAAAUUGG

<h3>_______________________________________________</h3><h3>Mutated DNA</h3>

GTTGGCGAATGAACTGAGGCTGACGTCTAAGCCTAGAAAAATTGG

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CAACCGCUUACUUGUCUCCGACUGCAGAUUCGGAUCUUUUUAACC

tRNA

GUUGGCGAAUGAACTGAGGCUGACGUCUAAGCCUAGAAAAAUUGG

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