question archive This pedigree shows the inheritance pattern of a recessive maternal effect gene in Drosophila
This pedigree shows the inheritance pattern of a recessive maternal effect gene in Drosophila
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This pedigree shows the inheritance pattern of a recessive maternal effect gene in Drosophila. In maternal effect, the offspring’s phenotype is under the control of nuclear gene products present in the mother's egg. In this example, the presence of the a + allele in the mother is required for proper wing development in the offspring. In the pedigree, individuals who are wingless are indicated by a shaded symbol. The phenotypes and genotypes are only provided for the first generation (individuals 1 and 2).What are all the possible genotypes for individual 1's mother? Select all that apply.
mom-a/a dad-a+/a
offspring: a+/a or a/a
Select all that apply.
a +/a +
a +/a
a/a
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The offspring have a+ a or a/a genotype.
Thr dad genotype is a+/a
When genotype of mother is a/a, then a+/a and a/a offsprings are produced. Because a gamete from mother and a+ from father produces a+/a genotype.
Similarly a gamete from father produces a/a genotype.
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When the genotype of mother is a+/a, then a+/a, a/aa and a+/a+ offsprings can be produced.
But when the genotype of mother is a+/a+, then a/a can't be produced. Because mother passes a+ gamete to the offspring.
Answer is a+/a and a/a
