In the flying purple people eater, the genes for flying ability and body color a

Question

In the flying purple people eater, the genes for flying ability and body color are located on the X chromosome and are thus linked (X- lined two factor cross). The ability to fly is dominant over flightless and purple body color is dominant over white. What will be the phenotypic ratios of the F1 and F2 generations when the parent generation consists of a homozygous male that is purple and flies and a homozygous female that is white and flightless? F1 phenotype: F2 phenotype: Now, repeat the cross and answer the questions for a parent generation that consists of a homozygous male that is white and flightless and a homozygous female that is purple and flies F1 phenotype: F2 phenotype:

Explanation / Answer

In plant cells only, prophase is preceded by a pre-prophase stage. In highly vacuolated plant cells, the nucleus has to migrate into the center of the cell before mitosis can begin. This is achieved through the formation of a phragmosome, a transverse sheet of cytoplasm that bisects the cell along the future plane of cell division. In addition to phragmosome formation, preprophase is characterized by the formation of a ring of microtubules and actin filaments (called preprophase band) underneath the plasma membrane around the equatorial plane of the future mitotic spindle. This band marks the position where the cell will eventually divide. The cells of higher plants (such as the flowering plants) lack centrioles; instead, microtubules form a spindle on the surface of the nucleus and are then organized into a spindle by the chromosomes themselves, after the nuclear membrane dissolves.The preprophase band disappears during nuclear membrane dissolution and spindle formation in prometaphase.

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