Q2. Dorothy crossed two plants, one tall and one short. She thinks that tall might be...
Q2. Dorothy crossed two plants, one tall and one short. She thinks that tall might be dominant over short and that the trait is carried on an autosome, but she is not sure and she does not know the genotypes of the parental plants she crossed.
(a) If Dorothy’s idea about the trait’s dominance and
transmission is correct, there are two possible crosses that she
might have performed. Write out the two crosses (you can invent
your own genotype notation).
(b) Dorothy’s cross generated 212 offspring, of which 115 were tall
and 97 were short. Which of the two crosses you wrote for (a) is no
longer a possibility if Dorothy’s ideas are correct?
(c) For the remaining cross, consider the offspring phenotype
ratios that would be generated by this cross as your null
hypothesis and perform a chi-square goodness of fit test to ask
whether you can reject this null hypothesis.
(d) Does Dorothy’s hunch about tall being dominant over short and
carried on an autosome still seem plausible or not?
Homework Answers
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Q2. Dorothy crossed two plants, one tall and one short. She
thinks that tall might be...
In an experiment, a student crosses two pea plants that are tall with purple flowers. She...
In an experiment, a student crosses two pea plants that are tall with purple flowers. She finds that the offspring of this cross have a 3:1 ratio of purple:white flowers and a 3:1 ratio of tall:short plants. However, individual plants could be tall and purple, tall and white, short and white or short and purple. Based on Mendel’s Law of Independent Assortment, what do you expect the phenotypic ratio to be, when accounting for all trait combinations? 3:1 3:3:3:3 9:3:3:1...
Mendel crossed pea plants dominant for two different traits tall and green pods) with pea plants...
Mendel crossed pea plants dominant for two different traits tall and green pods) with pea plants recessive for those same two traits (short and yellow pods). This cross resulted in pea plants that had combinations of all four traits tall with green pods, tall with yellow pods, short with green pods, and short with yellow pods). Which law of inheritance best describes why this happens? Multiple Choice O the law of segregation O the law of independent assortment O the...
(More Genetics Problems and Difficult Genetics Problems). MORE GENETICS PROBLEMS 1. When tall plants mate with...
(More Genetics Problems and Difficult Genetics Problems). MORE GENETICS PROBLEMS 1. When tall plants mate with dwarf plants, only tall plants occur in the offspring. Assign symbols and show the phenotypes and genotypes in the parental (P) and first filial generations for a cross between tall plants and dwarf plants that produces only tall plants. 2. Show the expected outcome when the F1 plants in problem #1 are crossed. Be sure to give both phenotype and genotype ratios for these...
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For questions 5 and 6: Tall (T) is dominant to short (t) 5. Ifa homozygous tall plant is crossed with a short plant, what percentage of the offspring will be tall? , The two parents used in this cross are called as breeding parents. 6. Iftwo heterozygous tall plants from the above are crossed, what percentage of the offspring will be short? For questions 7, 8 and 9: Purple (R) is dominant to white (r) If two white flowered plants...
1. If two strains of true-breeding plants that have different alleles for a certain character are...
1. If two strains of true-breeding plants that have different alleles for a certain character are crossed, their progeny are called a. the P generation. b. the F1generation. c. the F2generation. d. F1crosses. e. F2progeny. 2. Mendel’s crossing of spherical-seeded pea plants with wrinkled-seeded pea plants resulted in progeny that all had spherical seeds. This indicates that the wrinkled-seed trait is a. codominant. b. dominant. c. recessive. d. Both a and b e. Both a and c 3. Segregation of...
In a flowering plant, red flowers are dominant over white flowers, and short plants are dominant...
In a flowering plant, red flowers are dominant over white flowers, and short plants are dominant over tall plants. A short plant with red flowers was self-fertilized and the phenotypes for the resulting progeny recorded (see below). Based on the observed numbers, you propose the hypothesis that this dihybrid cross follows a 9:3:3:1 phenotypic ratio, whereby Mendel's laws apply. Based on this hypothesis, you calculated the expected number of progeny for each phenotype (see below). Phenotype Observed Number of Plants...
1. The presence of short hairs on the leaves of tomato plants is a dominant trait...
1. The presence of short hairs on the leaves of tomato plants is a dominant trait controlled by the allele H.The corresponding recessive trait, smooth leaf, is found in plants with the genotype hh. The table below shows the progeny of three independent crosses of parental plants with genotypes and phenotypes that are unknown. Number of Progeny Hairy Leaf Smooth Leaf Cross 1: Cross 2: Cross 3: 32 42 45 24 Examine the distributions of phenotypes in the progeny of...
Table 1: Mendel's Traits and Symbols for Pea Plants Traits Symbol Symbol Dominant Allele Round Yellow...
Table 1: Mendel's Traits and Symbols for Pea Plants Traits Symbol Symbol Dominant Allele Round Yellow Smooth Green Tall Axial Seed Shape Seed Color Pod Shape Pod Color Plant Height Flower Position S Recessive Allele Wrinkled Green Constricted Yellow Short Terminal а Refer back to Table 1 on the first pa abie 1 on the first page of this assignment to answer the following two questions. Use the appropriate symbols and phenotypes in your answer, 1. Show the genotypes of...
You have two families of true-breeding diploid Zea mays(maize, corn) plants. Late flowering, with tall stalks...
You have two families of true-breeding diploid Zea mays(maize, corn) plants. Late flowering, with tall stalks Early flowering, with short stalks A cross between these two plants yields F1 hybrids that are late flowering, with tall stalks. Given this information, which alleles are dominant? Explain your reasoning. Using the letters F or f for flowering and T or t for stalk height, indicate the genotypes of the two plants. Plant 1 ______________ Plant 2 ___________________ What is the genotype of the...
Mendel crossed pea plants dominant for two different traits tall and green pods) with pea plants recessive for those same two traits (short and yellow pods). This cross resulted in pea plants that had combinations of all four traits tall with green pods, tall with yellow pods, short with green pods, and short with yellow pods). Which law of inheritance best describes why this happens? Multiple Choice O the law of segregation O the law of independent assortment O the...
(More Genetics Problems and Difficult Genetics Problems). MORE GENETICS PROBLEMS 1. When tall plants mate with dwarf plants, only tall plants occur in the offspring. Assign symbols and show the phenotypes and genotypes in the parental (P) and first filial generations for a cross between tall plants and dwarf plants that produces only tall plants. 2. Show the expected outcome when the F1 plants in problem #1 are crossed. Be sure to give both phenotype and genotype ratios for these...
9. In tomato plants, the tall allele (T) is dominant to the short allele (t) for height. In addition, the allele for red fruit (R) is dominant to the allele for yellow fruit (r). Please show the cross between the following two plants (one tall, red and the other tall, yellow). TTRR X Tter 3 a. What is the genotypic ratio of the offspring? 6:2 b. Can you get any tall, yellow plants (that look like the one parent) from...
For questions 5 and 6: Tall (T) is dominant to short (t) 5. Ifa homozygous tall plant is crossed with a short plant, what percentage of the offspring will be tall? , The two parents used in this cross are called as breeding parents. 6. Iftwo heterozygous tall plants from the above are crossed, what percentage of the offspring will be short? For questions 7, 8 and 9: Purple (R) is dominant to white (r) If two white flowered plants...
1. The presence of short hairs on the leaves of tomato plants is a dominant trait controlled by the allele H.The corresponding recessive trait, smooth leaf, is found in plants with the genotype hh. The table below shows the progeny of three independent crosses of parental plants with genotypes and phenotypes that are unknown. Number of Progeny Hairy Leaf Smooth Leaf Cross 1: Cross 2: Cross 3: 32 42 45 24 Examine the distributions of phenotypes in the progeny of...
Table 1: Mendel's Traits and Symbols for Pea Plants Traits Symbol Symbol Dominant Allele Round Yellow Smooth Green Tall Axial Seed Shape Seed Color Pod Shape Pod Color Plant Height Flower Position S Recessive Allele Wrinkled Green Constricted Yellow Short Terminal а Refer back to Table 1 on the first pa abie 1 on the first page of this assignment to answer the following two questions. Use the appropriate symbols and phenotypes in your answer, 1. Show the genotypes of...
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