Mendel used dihybrid crosses to test the idea that alleles for two different characters assort independently. In a typical dihybrid cross (such as RrTt x RrTt), what proportions of phenotypes would be expected in the offspring? Select one: a. 9:3:3:1 b. 4:4:4:4 c. 2:2 d. 3:1 e. 100% dominant phenotype

Mendel used dihybrid crosses to test the idea that alleles for two different characters assort independently. In a typical dihybrid cross (such as RrTt x RrTt), what proportions of phenotypes would be expected in the offspring? Select one: a. 9:3:3:1 b. 4:4:4:4 c. 2:2 d. 3:1 e. 100% dominant phenotype

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Description: Mendel used dihybrid crosses to test the idea that alleles for two different characters assort independently. In a typical dihybrid cross (such as RrTt x RrTt), what proportions of phenotypes would be expected in the offspring?Select one:a. 9:3:3:1b

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter9: Patterns Of Inheritance

Section: Chapter Questions

Problem 1CT

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Mendel also studied tall and short varieties of pea plants. When he crossed tall x short plants together, the F1were tall. The tall F1 plants were self-hybridized to produce the F2. What proportion of phenotypes would be expected in the F2? 1:2:1 tall:intermediate:short 3:1 tall:short 1:1 tall:short 3:1 short:tall 1:2:1 intermediate:tall:short
Why did Mendel perform "reciprocal crosses"? Someone gives you a bag of yellow peas and you plant them in the Spring. Can you predict the color of the peas that will appear in the pods on the plants grown from these peas? Would your answer be different if you had received a bag of green peas? Explain what Mendel means when he writes that the 3:1 ratio observed in the first generation from the hybrids "resolves itself" into a ratio of 2:1:1
When Mendel was conducting his research, he crossed two different varieties of pea plants, one that had jagged leaves with 8 points on each leaf and one that had perfectly smooth leaves. He found that the offspring all had 4 to 5 points on each leaf. Based on what you have learned in this course, how would you explain this result to Mendel?
Over the years, Mendel experimented with more than 30,000 pea plants. Why did Mendel collect data on so many plants? Why didn’t he study just one cross? Hint: Read “What Are the Odds?” on page 124 before answering.
Which of the following is evidence that Mendel had that helped him to construct his Law of Segregation?A) His F2 generation in the dihybrid cross resulted in a 1:1:1:1 distribution of phenotypes.B) He found no linkage of different genes in the offspring of his pea plants.C) The F1 generation of the monohybrid cross resulted in blended phenotypes.D) The F2 generation of the monohybrid cross resulted in the recessive trait reappearing as a phhenotype.E) Two of the above are correct.
When Mendel crossed in his P generation a yellow-seeded and green-seeded pea plants, all the offspring were yellow seeded. When he took these F1 yellow-seeded plants and crossed them with the original yellow-seeded plant from the P generation, what genotypic ratio was expected? Group of answer choices 1:2:1 3:1 1:1:1:1 1:1
Mendel performed crosses in which he used pollen from a white-flowered plant to fertilize a purple-flowered plant and pollen from a purple-flowered plant to fertilize a white-flowered plant, showing the same results with both. What did these reciprocal crosses demonstrate? A. That the plants were not sterile. B. That there was no epistasis. C. That the trait could be passed from either parent. D. B and C.
Mendel crossed homozygous plants with green seeds with homozygous plants with yellow seeds and found what all offspring were yellow construct a genetic diagram to show f1 and f2 generation
Gregor Mendel proposed the law of independent assortment based on the observation that dihybrid crosses of heterozygous individuals produced progeny in a 9:3:3:1 ratio. For this observation to hold, which assumption must be true? A. The traits are governed by genes on different chromosomes. B. The traits are governed by genes on the same chromosome. C. The traits are governed by genes with only two alleles. D. The traits are governed by genes with only three alleles.
In classical Mendelian genetics, how can one check the genotype of a parent (A) expressing the characters of a dominant allele? Select one: a. By performing a back cross with a recessive homozygote parent (B). If the A parent is homozygote for the dominant allele, then all the individuals from the F1 will display the dominant character. If the parent A was, instead, a heterozygote, then 50% of the F1 progeny will express the recessive character (homozygote recessive) and 50% the dominant one (heterozygotes). b. It is impossible to check such genotype without using specific molecular assays. c. By performing a back cross with a dominant homozygote parent (B). If the A parent is homozygote for the dominant allele, then all the individuals from the F1 will display the dominant character.
Gregor Mendel noticed that recessive characteristics are "masked" in the F1 generation but reappear in the F2 generation. Which of the following laws best explains this observation? a. The law of products b. The law of segregation c. The law of independent assortment d. The law of linked alleles e. None of the above
Mendel wondered if the separation of alleles on one gene had any effect on the separation of alleles on another. To test this, Mendel looked at plants that were pure breeding for two traits at once—he crossed plants that were pure breeding for two traits with plants that were pure breeding for the opposite forms of the same traits. In conducting and analyzing those crosses, Mendel was able to discover predictable patterns and ratios in the phenotypes of the F1 and F2 offspring. Problem (Purpose) In this lab, you will explore mouse coat colour and eye colour as two separate genetic traits. Procedure Use the following information to answer the analysis questions. Black fur is dominant so the offspring must inherit one “F” allele to be black. White fur is recessive so the offspring must inherit two “f” alleles to be white. Black eyes are dominant so the offspring must inherit one “E” allele to be black eyed. Red eyes are recessive so the offspring must inherit two “e” alleles to…