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Different populations of Dr. Remington's rock cress plants (Arabidopsis lyrata) are pure-breeding for different combinations of hairy vs. smooth leaves (alleles H vs. h at one gene), and lobed vs. non-lobed leaves (alleles L vs. I at a second gene linked to the first). He has a tray of F₁ plants with hairy lobed leaves (genotype Hh Ll), but lost the label so he doesn't know which populations were crossed to produce them. He does a testcross of the F₁ plants, and obtains the following progeny: 81 hairy lobed, 18 hairy non-lobed, 24 smooth lobed, and 77 smooth non- lobed. What alleles were on each of the two homologous chromosomes in the F₁ plants, and what were the phenotypes of the two parent populations of the F₁ plants?

Different populations of Dr. Remington's rock cress plants (Arabidopsis lyrata) are pure-breeding for different combinations of hairy vs. smooth leaves (alleles H vs. h at one gene), and lobed vs. non-lobed leaves (alleles L vs. I at a second gene linked to the first). He has a tray of F₁ plants with hairy lobed leaves (genotype Hh Ll), but lost the label so he doesn't know which populations were crossed to produce them. He does a testcross of the F₁ plants, and obtains the following progeny: 81 hairy lobed, 18 hairy non-lobed, 24 smooth lobed, and 77 smooth non- lobed. What alleles were on each of the two homologous chromosomes in the F₁ plants, and what were the phenotypes of the two parent populations of the F₁ plants?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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F₁ chromosomes Parental population phenotypes ||| = = ||| = Hairy non-lobed leaves; and smooth lobed leaves hairy lobed leaves; and smooth non- lobed leaves HH LL/hh ll HH Il/hh LL either HH LL/hh ll or HH Il/hh LL
Transcribed Image Text:F₁ chromosomes Parental population phenotypes ||| = = ||| = Hairy non-lobed leaves; and smooth lobed leaves hairy lobed leaves; and smooth non- lobed leaves HH LL/hh ll HH Il/hh LL either HH LL/hh ll or HH Il/hh LL
Different populations of Dr. Remington's rock cress plants (Arabidopsis lyrata) are pure-breeding for different combinations of hairy vs. smooth leaves (alleles H vs. h at one gene), and lobed vs. non-lobed leaves (alleles L vs. I at a second gene linked to the first). He has a tray of F₁ plants with hairy lobed leaves (genotype Hh Ll), but lost the label so he doesn't know which populations were crossed to produce them. He does a testcross of the F₁ plants, and obtains the following progeny: 81 hairy lobed, 18 hairy non-lobed, 24 smooth lobed, and 77 smooth non- lobed. What alleles were on each of the two homologous chromosomes in the F₁ plants, and what were the phenotypes of the two parent populations of the F₁ plants?
Transcribed Image Text:Different populations of Dr. Remington's rock cress plants (Arabidopsis lyrata) are pure-breeding for different combinations of hairy vs. smooth leaves (alleles H vs. h at one gene), and lobed vs. non-lobed leaves (alleles L vs. I at a second gene linked to the first). He has a tray of F₁ plants with hairy lobed leaves (genotype Hh Ll), but lost the label so he doesn't know which populations were crossed to produce them. He does a testcross of the F₁ plants, and obtains the following progeny: 81 hairy lobed, 18 hairy non-lobed, 24 smooth lobed, and 77 smooth non- lobed. What alleles were on each of the two homologous chromosomes in the F₁ plants, and what were the phenotypes of the two parent populations of the F₁ plants?
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