A researcher has selfed an autotetraploid plant with the genotype D / D / d / d
ID: 253068 • Letter: A
Question
A researcher has selfed an autotetraploid plant with the genotype D/D/d/d, and in the resulting progeny she observes a 35:1 phenotypic ratio. What can she conclude from this observation?
The progeny from this cross do not demonstrate a standard Mendelian phenotypic ratio. In the 35:1 phenotypic ratio, the 1 represents the phenotype of the d/d/d/d progeny. During meiosis in the D/D/d/d parent plant, it is likely that only bivalents, no quadrivalents or trivalents, formed. It is likely that in this plant species, gametes associate with one another randomly. All of the answers are correct.Explanation / Answer
The answers are
The progeny from this cross do not demonstrate a standard Mendelian phenotypic ratio. - Because Mendal worked with diploid plants only.
In the 35:1 phenotypic ratio, the 1 represents the phenotype of the d/d/d/d progeny. - On the basis of this observed ratio, it indicates that those showing an epistatis like duplication dominant epistatis.
The following are not the answers because
During meiosis in the D/D/d/d parent plant, it is likely that only bivalents, no quadrivalents or trivalents, formed. - In tetraplid plants the quadrivalent formation is common,along with this there is a chance of formation of bi and trivalent.s
It is likely that in this plant species, gametes associate with one another randomly. - In this type of plants there is chance of one chromosome associate with another randomly not one gamete associate with another randomly.
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