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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 at 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).
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Correct
For a maternal effect trait, an offspring’s phenotype is determined by the mother’s genotype. In this case, the genotype of individual 1’s grandmother is not known; therefore, her mother’s phenotype cannot be predicted.
Part E What are all the possible genotypes for individual 2’s mother?
Select all that apply.
A, a+/a+
B, a+/a
C,a/a
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♦ Relevant knowledge
Drosophila embryogenesis, also known as the process of forming Drosophila (fruit fruit) embryos is a well-known model system of the fields of developmental biology and genetics. The concept evolutionary developmental biology emerged from the study of the embryogenesis. It solved the century-old question of how development could be controlled.
Part E: Answer is Option C, a/a
Explanation:
WT dominant allele = a+
Mutant recessive allele = a
Maternal effect gene: All her children will be affected if the mother is affected. Individual 2 is affected. His mother also must be affected. Genotype of the mother = a/a