Gregor Mendel followed specific steps when breeding pea plants to determine the underlying cause and mathematical ratio of specific traits. Identify the order of his process and findings. 1 [Choose ] 2 [ Choose ] 3 [ Choose ] 4 [ Choose ] >
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- The text outlines some of the problems Frederick William I encountered in his attempt to breed tall Potsdam Guards. a. Why were the results he obtained so different from those obtained by Mendel with short and tall pea plants? b. Why were most of the children shorter than their tall parents?When Gregor Mendel performed his breeding experiments on pea plants, he discovered that tallness in the plants is inherited through a simple dominant trait (coded "T") with shortness as the recessive trait (coded "t"). Imagine that Mendel bred a homozygous dominant pea plant with a pea plant heterozygous for tallness. Draw a Punnett Square to help you answer this question and the next one: In the 1st generation of offspring, we expect the genotypes (for tallness) to include… a) 50% homozygous dominant, 50% heterozygous b) 100% heterozygous c) 50% tall, 50% short d) 100% tall e) None of the aboveWhen Gregor Mendel performed his breeding experiments on pea plants, he discovered that tallness in the plants is inherited through a simple dominant trait (coded "T") with shortness as the recessive trait (coded "t"). Imagine that Mendel bred a homozygous dominant pea plant with a pea plant heterozygous for tallness. Draw a Punnett Square to help you answer this question and the next one: In the 1st generation of offspring, we expect the phenotypes (for tallness) to include… a) 50% homozygous dominant, 50% heterozygous b) 100% heterozygous c) 50% tall, 50% short d) 100% tall e) None of the above
- 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.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 2:1:1Mendel 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…
- As you know Mendel’s main contribution to genetics was his proposing a model of particulate inheritance. This discovery contradicted the widely held belief that blending inheritance was the true theory that explained hereditary traits. One advantage that Mendel had in choosing garden peas (Pisum sativum) was that he could either allow the pea flowers on a plant to self-pollinate or he could deliberately cross-pollinate the flowers. For his single locus crosses of pure-breeding lines, he would take the F2 offspring of the dominant phenotype (such as yellow seeds) and ensure that each yellow-seeded plant would self-pollinate. He was able to show that 1/3 of all the yellow-seeded plants in this generation bred true while the other 2/3 of the yellow seeded plants showed segregation. Do you believe that this extra experiment gave additional important evidence for the particulate theory of inheritance or did the offspring from the F1 x F1 cross provide enough evidence of Mendel’s First Law?…Mendel crossed two Pea plants for plant height and flower color Tall plant (T) is dominant to Short Plant (t). Purple Flower (P) is dominant to white flower (p). Using the following information perform the dihybrid cross using punnett squares that will predict all possible genotypes of the offspring and list the number and description of the phenotypes of the offspring. A. One plant homozygous dominant for plant height and flower color crossed with another plant homozygous recessive for plant height and heterozygous for flower color.When Mendel did his experiments, it was the case that the genes for each trait were on separate pairs of homologous chromosomes. For example, the genes for pod color were on one pair of chromosomes and the genes for the seed coat were on a different pair of chromosomes. What if the genes for the two traits were on the same chromosome? (That is, if the gene for pod color was on the same chromosome as the gene for seed coat.) Would Mendel’s 2nd Law still hold? Why or why not?
- Imagine that Mendel is tending a garden of 100 pea plants. He has 20 plants that are homozygous for the purple allele, 50 plants that are heterozygous, and 30 plants that are homozygous for the white allele. What is the frequency of the purple (P) allele? What is the frequency of the white (p) allele?Mendel crossed yellow-seeded and green-seeded pea plants and then allowed the offspring to self-pollinate to produce an F2 generation. The results were as follows: 6022 yellow and 2001 green (8023 total). The allele for green seeds has what relationship to the allele for yellow seeds? A. co-dominant. B. dominant C. semi-dominant D. incompletely dominant E. recessiveYou have decided to start growing pea plants in your garden that are of the same species as the ones Mendel grew to see if you can recapitulate some of his experiments. The two traits you start with are purple vs white flowers and tall vs dwarf (with purple and tall being dominant). A neighbor shares some of their tall, purple flowered plants with you, knowing from those you should be able to get every possible combination, but they warn you that they have not been paying attention to how they are pollinating one another, and therefore they aren’t sure which of them are homozygotes and which are heterozygotes for each trait.What are the possible genotypes for these purple, tall plants?