In animals, embryonic lethal mutations can either in zygotic or maternal effect.  In zygotic embryo lethal mutations, the genotype of the embryo determines the phenotype of the embryo.  In contrast, mutations in genes encoding products that the mother deposits in the egg often result in maternal effects - i.e. it is the genotype of the mother, not the genotype of the embryo, that determines the phenotype of the embryo.  Diagram crosses that would allow you to determine whether an embryo lethal mutation is due to zygotic lethality or maternal effect lethality. How would you devise a screen to identify recessive mutations in Drosophila that result in maternal effect lethality?

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Q: A male mouse with genotype Igf2 Igf2m is crossed with a female who is Igf2 Igf2.  What would be the…

A: 3/4 of the offspring would be normal; 1/4 would be dwarf

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Q: Draw a Punnett square for the dihybrid cross. There are two known alleles of gene occupying a…

A: Dihybrid cross involves two genes in a cross. That's why the two traits are involved in this cross.

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Q: A recessive mutation pd causes purple eyes in Drosophila, in contrast to the wildtype red eyes. A…

A: The objective of this question is to determine the proportion of offspring that will have purple…

Q: Parent Cross: Blue-Eyed Male x Normal Female Blue-Eyed Female F1 Offspring Normal Male Normal Female…

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Q: Sex determination in birds is different from that in humans. The sex chromosomes in birds are called…

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Q: THEME 2: The figure below shows the types and numbers of gametes produced by a trihybrid. Phenotype…

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Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.