In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the surviving offspring of a cross between a male that is heterozygous for the lethal allele and a normal female? a. 2:1 male to female b. 1:2 male to female c. 1:1 male to female d. 4:3 male to female e. 3:1 male to female

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A:

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Q: geny are obtaine

A:

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A:

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.