Deep in a previously unexplored South American rain forest, a plant species was discovered with true-breeding varieties whose flowers were pink, rose, orange, or purple. A very astute plant geneticist made a single cross, carried to the F₂ generation, as shown:
P₁: purple × pink
F₁: all purple
F₂: 27/64 purple 16/64 pink 12/64 rose 9/64 orange
Based solely on these data, he proposed both a mode of inheritance for flower pigmentation and a biochemical pathway for the synthesis of these pigments. Carefully study the data. Create a hypothesis of your own to explain the mode of inheritance. Then propose a biochemical pathway consistent with your hypothesis. How could you test the hypothesis by making other crosses?

Question

Deep in a previously unexplored South American rain forest, a plant species was discovered with true-breeding varieties whose flowers were pink, rose, orange, or purple. A very astute plant geneticist made a single cross, carried to the F₂ generation, as shown:

P₁: purple × pink

F₁: all purple

F₂: 27/64 purple 16/64 pink 12/64 rose 9/64 orange

Based solely on these data, he proposed both a mode of inheritance for flower pigmentation and a biochemical pathway for the synthesis of these pigments. Carefully study the data. Create a hypothesis of your own to explain the mode of inheritance. Then propose a biochemical pathway consistent with your hypothesis. How could you test the hypothesis by making other crosses?

Accepted Answer

everyone. Let's take a look at this question together. Which of the following statements about mutations in the mitochondrial D. N. A. Is true. So let's recall what we know about mutations and mitochondrial D. N. A. To try to figure out which of the following statements are true. So we know that these mutations in the mitochondrial D. N. A. Are inherited from the mother because the mitochondria is inherited through the egg and not the sperm. So it comes from the mother. And we know that these mutations affect both male and female because the males can inherit the mutation from the mother. However they cannot pass it on. So males it s it on because that mitochondria is inherited through the egg and not the sperm. So the males can in fact inherited from the mother. They cannot pass it on to their offspring. So looking at the following statements to try to figure out which one is true. We can see answer choice B says it is inherited through the maternal line. Which we know is true because we inherited from the mother and not the father. Which means that answer choice A. Is incorrect and we know that it can affect both male and female. Which makes answer choice C. Incorrect. And then we know that it can't be passed on to offspring for males because it is inherited through the egg and not the sperm. Which means answer choice D. Is incorrect and answer choice B. Is the only statement here about mutations in the mitochondrial D. N. A. That is true. I hope you found this video to be helpful. Thank you and goodbye.

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Key Concepts

Mendelian Inheritance

Phenotypic Ratios

Biochemical Pathways