Bateson and Punnett determined that the genes for flower color (purple vs. red) and pollen shape (long vs. round) in sweet peas fail to follow Mendel's law of
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In sweet pea plants, purple flower color is dominant over red flower color and long pollen grain shape is dominant over round pollen grain shape. Two sweet pea plants that are heterozygous for both flower color and pollen grain shape are crossed with one another. A geneticist is surprised to observe that there are far fewer round, purple offspring and long, red offspring than were predicted by the 9:3:3:1 expected phenotypic ratio. Which of the following statements provides the most reasonable prediction to account for the deviation from the expected results? In sweet pea plants, the gene for flower color and the gene for pollen grain shape are closely linked on the same chromosome. In sweet pea plants, the genes for flower color and for pollen grain shape both exhibit codominance. Several mutations occurred spontaneously producing a deviation from the expected phenotypic ratios of the offspring. The genes for flower color and pollen grain shape are inherited independently because of the law of independent assortment.
Adi S.
Jenny W.
Purple flowers versus red flowers and long pollen versus round pollen are two traits in a sweet pea plant. When a true-breeding purple/long pollen plant is crossed with a true-breeding red/round pollen plant, the F1 generation offspring all have purple flowers and long pollen. When the F1 generation is bred to itself via human-directed fertilization, a ratio of 7:4.9:4.9:0.05, purple/long:red/long:purple/round:red/round is noted in the F2 generation. What is the most likely reason for this ratio? Group of answer choices: The round pollen is less likely to fertilize the pea plants. The genes for flower color and pollen shape are linked. The red flower color is less likely to be noticed by bees. The red color is a partially lethal allele.
Jakob W.
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