PATHOLOGY MCQ
GENETICS AND DISEASE
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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There are two types of pea plants:those that produce round seeds and those that produce wrinkled seeds. A single gene controls which type of seed a pea plant will produce.An experiment shows that pea plants containing an allele for wrinkled seeds may still produce round seeds.Based on this information, we can conclude that the allele for wrinkled seeds in pea plants is ____
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recessive
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heterozygous
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dominant
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homozygous
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Explanation:
Detailed explanation-1: -The wrinkled-seed mutant (rr) of pea (Pisum sativum L.) arose through mutation of the gene encoding starch-branching enzyme isoform I (SBE1) by insertion of a transposon-like element into the coding sequence. Two isoforms of starch-branching enzyme have been documented in the developing pea embryo.
Detailed explanation-2: -Final answer: Two pea plants, one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F1 progeny that has round, yellow (RrYy) seeds. When F1 plants are selfed, the F2 progeny will have a new combination of characters, the combination will be round, yellow and wrinkled green.
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