Question What is the phenotype of individual 1\'s mother? wingless wild type nee

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What is the phenotype of individual 1's mother?

wingless wild type need more information 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) 1 1 a/a at/a

Explanation / Answer

What is the phenotype of individual 1's mother?

A) wingless

For a maternal effect trait, an offspring's genotype results from an independent assortment of the alleles from the both parents, while the offspring's phenotype is determined only by the mother’s genotype. Since the individual 1 has a normal phenotype, we can deduce that her mother cannot have an a/a genotype. And because individual 1’s genotype is a/a, her mother must be heterozygous (a+/a). Therefore, she can contribute an a allele to her daughter (the other a allele came from her father).

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