(6 points) A maize plant is homozygous for an allele C m , caused by the inserti
ID: 40520 • Letter: #
Question
(6 points) A maize plant is homozygous for an allele Cm, caused by the insertion of a Ds element into the coding region of a gene (C) that encodes an enzyme necessary for the synthesis of anthocyanin in maize kernels.
(i) If this plant also contains an Ac element in its genome, what will be the phenotype of its kernels? Justify your answers.
(ii) If this plant does not contain an Ac element, what will be the kernel phenotype? Justify your answers.
(iii) If the plant does not contain an Ac element, but it does contain an autonomous element for another family of transposon, what will be the kernel phenotype? Justify your answers.
Explanation / Answer
It is an Ds/Ac system of transposable elements discovered by McClintock. Let's once review her observations that would help in ansering the Q:-
observations:
(i) If plant contains an element Ac also, the phenotype would be mutated i.e. may be dotted pigmentation, because Ds/Ac system together cause the deletions and move the sequence such that thedominant allele segregates with recessive alle
(ii) If the plant does not conain Ac element, the plat would be phenotypically homozygous for Cm., since there would be no movement for Ds alone
(iii) If this change is induced aritificaially, then if Ds is responsible for dissociation then the other family protein should be responsible for association like that of As. Only then mutations may occur
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