A form of male sterility in corn is inherited maternally. Marcus Rhoades first described this cytoplasmic male sterility by crossing female gametes froma male sterile plant with pollen from a male fertileplant. The resulting progeny plants were malesterile.a. Diagram the cross, using different colors andshapes to distinguish between nuclear (lines) andcytoplasmic (circles) genomes from the male sterile (one color) and male fertile (another color)strains.b. Female gametes from the male sterile progenywere backcrossed with pollen from the same malefertile parent of the first cross. The process was repeated many times. Diagram the next two generations including possible crossover events.c. What was the purpose of the series of backcrosses?[Hint: Look at your answer to part (b) and thinkabout what is happening to the nuclear genome.]Why could Rhoades interpret these results as ademonstration of cytoplasmic male sterility?
A form of male sterility in corn is inherited maternally. Marcus Rhoades first described this cytoplasmic male sterility by crossing female gametes from
a male sterile plant with pollen from a male fertile
plant. The resulting progeny plants were male
sterile.
a. Diagram the cross, using different colors and
shapes to distinguish between nuclear (lines) and
cytoplasmic (circles) genomes from the male sterile (one color) and male fertile (another color)
strains.b. Female gametes from the male sterile progeny
were backcrossed with pollen from the same male
fertile parent of the first cross. The process was repeated many times. Diagram the next two generations including possible crossover events.
c. What was the purpose of the series of backcrosses?
[Hint: Look at your answer to part (b) and think
about what is happening to the nuclear genome.]
Why could Rhoades interpret these results as a
demonstration of cytoplasmic male sterility?
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