** Please explain ** Assume that x is a new mutant allele in corn. An x/x plant
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Question
** Please explain **
Assume that x is a new mutant allele in corn. An x/x plant is crossed with a triple-10 individual (trisomic for chromosome 10 only) carrying only wild-type dominant alleles at the X locus (Cross 1). Trisomic progeny for chromosome 10 are recovered and crossed back to the x/x plant (Cross 2).
(a) What ratio of dominant to recessive phenotypes is expected if the X locus is not in chromosome 10? (Hint: Write out the parental and progeny genotypes for the X locus for both Cross 1 and Cross 2 keeping in mind that it is not on chromosome 10).
(b) What ratio of dominant to recessive phenotypes is expected if the X locus is in chromosome 10? (Hint: Write out the parental and progeny genotypes for the X locus for both Cross 1 and Cross 2 keeping in mind that it now is on chromosome 10).
Explanation / Answer
(a) All will be recessive in both the crosses 1 and 2.
(b) All will be dominant in cross 1 and all will be recessive in cross 2.
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