Question
Do the alleles for different characters always sortindependently? In biology lab, you conduct a breeding experiment to testMendel?s law of independent assortment. You study two
Do the alleles for different characters always sortindependently?
In biology lab, you conduct a breeding experiment to testMendel?s law of independent assortment. You study two characters ina new plant species recently discovered on campus:
Flower color, which can be blue (BB) or purple(bb)
Petal shape, which can be pointy (PP) or rounded(pp)
You use the following procedure.
In the parental generation, you breed a plant that you know tobe homozygous for blue-pointy flowers (BBPP) with a plantthat you know to be homozygous for purple-rounded flowers(bbpp).
In the F1 generation, all your plants haveblue-pointy flowers (BbPp).
You then allow the F1 plants to self-pollinate toproduce F2 offspring. In the F2 generation,you obtain 80 plants with the following phenotypes. Note that anunderscore ?_? in the genotype indicates that the second allele forthat gene could be either dominant or recessive:
mostly BP and bp BP, Bp, bP, bp in equal numbers 2 predominant phenotypes 4 phenotypes 3 blue-pointy: 1 purple- rounded 9 blue-pointy: 1 purple- rounded no yes Predicted F gametes Predicted number of phenotypes in F offspring Predicted ratio of phenotypes in F offspring Hypothesis supported by the data? a Hypothesis 1 (independent assortment) BP, Bp, bP, bp in equal numbers 4 phenotypes 9 blue-pointy: 3 blue-rounded: 3 purple-pointy: 1 purple-rounded yes b (d) f h Hypothesis 2 mostly BP and bp (e) O Hypothesis 3
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