Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Two true-breeding varieties of maize, one 11 cm high and the other 47 cm high were crossed and the resultant F1 hybrids were then crossed to generate the F2 . In the F2 there were a total of 13,923 plants with a continuous variation in heights between the two extremes and with only 3 plants as large as 47 cm high and 5 plants of 11 cm high.SO In a cross between a 29cm plant and a 20cm plant what would be the genotypes giving the smallest number of different
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Genes are the units of heredity that carry coded genetic information in the form of nucleotide sequences in DNA. This coded genetic information is passed on from parents to the offspring through successful reproduction.
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- You have determined that the gene order for three linked genes being studied is CBA. The number of recombinants resulting from crossover between genes A and B alone totals 40 and 42, while the double-crossover progeny total 4 and 6. What is the recombination frequency between genes A and B if the total number of progeny from the cross is 1000? O 0.102% O 0.092% O 10.2% O 0.082% O 8.2% O 1% O 9.2%arrow_forwardAssume that, in a series of experiments, plants with round seeds were crossed with plants with wrinkled seeds and the following offspring were obtained: 215 round and 185 wrinkled. How do you explain these observations and what would be the expected number of offspring with round seed and with wrinkled seed? The plants with round seeds are heterozygous for the round seed phenotype and F1 offspring is expected to show 200 round and 200 wrinkled seed. The plants with round seeds are homozygous for the round seed phenotype and F1 offspring is expected to show 300 round and 100 wrinkled seed. The plants with round seeds are heterozygous for the round seed phenotype and F1 offspring is expected to show 100 round and 300 wrinkled seed. The plants with round seeds are homozygous for the round seed phenotype and F1 offspring is expected to show 200 round and 200 wrinkled seed. The plants with round seeds are heterozygous for the round seed phenotype and F1 offspring is…arrow_forward41) A pea plant known to be heterozygous at three loci is test crossed. The progeny phenotypes and the frequencies are as follows: abç +++ abc +bc a++ ++c ab+ +b+ a+c 455 470 35 33 37 -- 35 460 475 bac +++ What is the linkage arrangement of the genes? a) abc b) bac c) acb e) ab are linked c assorts independently d) ac are linked b assorts independentlyarrow_forward
- 10) Two pure-breeding phlox plants were crossed, one with dark-blue flowers and the other with pinl The Fi generation all had dark-blue flowers. When the F₁ were crossed with each other, the F₂ generati consisted of 176 plants: 101 with dark-blue flowers, 33 with light-blue flowers, 30 with red flowers, ar pink flowers. 10) What progeny types would result from crossing pure-breeding plants with light-blue flowen breeding plants with red flowers? A) all would be dark blue B) 1 light blue: 1 red C) 9 dark blue: 3 light blue: 3 red: 1 pink D) all would be redarrow_forward1) Two true-breeding varieties of maize, one 11 cm high and the other 47 cm high were crossed and the resultant F1 hybrids were then crossed to generate the F2 . In the F2 there were a total of 13,923 plants with a continuous variation in heights between the two extremes and with only 3 plants as large as 47 cm high and 5 plants of 11 cm high. a) How many i) genes and ii) how many alleles are involved in determining height in this plant? b) What is the contribution of each dominant allele to the phenotype in cm?arrow_forwardA pea plant with a tall phenotype is pollinated by a short plant, and the seeds of the first generation hybrid produce 327 tall plants and 321 short plants. Give the genotypes of all the plants.arrow_forward
- A true-breeding purple-leafed plant isolated from one side of El Yunque, the rain forest in Puerto Rico, was crossed to a truebreeding white variety found on the other side. The F1 offspring were all purple. A large number of F1 * F1 crosses produced the following results: purple: 4219 white: 5781 (Total = 10,000) Propose an explanation for the inheritance of leaf color. As a geneticist, how might you go about testing your hypothesis? Describe the genetic experiments that you would conductarrow_forwardthe heights of two true breeding strains of maize were both 1.75m and when crossed the F1 height was also 1.75m. Selfing the F1 produced an F2 with a range of heights from 1.59 to 1.91m. Out of the F2 of 451 plants there were 25 of the tallest. If the F1 was test-crossed, how many phenotypes would you observe?arrow_forwardAssume that the length of a type of cucumber at maturity is controlled by two genes (A and B), each of which has two alleles. The A and B alleles each add 3 inches of cucumber growth, while the a and b alleles add only 1 inches. If a plant with genotype Aabb is crossed to a plant with genotype AaBb, what ratios of lengths are expected in the progeny? 1/8-12”, 3/8-10”, 3/8-8”, 1/8-6” 1/2-8”, 3/8-6”, 1/8 4” 1/8-10”, 3/8-8”, 3/8-6”, 1/8-4” 1/2-12”, 3/8-10”, 1/8 8” 1/2-10”, 3/8-8”, 1/8 6”arrow_forward
- What would justify the following ratio appearing after phenotyping the outcome of a crossing trial: 8.9: 2.9: 3.2:1? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a b C d Obviously this represents independent assortment based on crossing dihybrid heterozygotes. Obviously this represents gene linkage based on test crossing a dihybrid heterozygote. Obviously this represents the results of a trihybrid test cross. Obviously this represents independent assortment based on crossing monohybrid heterozygotes.arrow_forwardYou have determined that the gene order for three linked genes being studied is A B C. The number of recombinants resulting from crossover between genes A and BC are 44 and 48, respectively, while the double-crossover progeny total 4 and 6. What is the recombination frequency between genes A and B if the total progeny from the cross is 1000? Show all of your work.arrow_forwardIn tomatoes, regular leaves (L) are multilobed and serrated and potato leaves (l) are broad, smooth, and single (Image 1). Red fruit (F) is dominant to yellow fruit (f). A cross is carried out between two pure lines of tomato plants, one having regular leaves and red fruit and the other having potato leaves and yellow fruit. The F1 generation all have regular leaves and red fruit. The F1individuals are then crossed with one another. Complete a Punnett square to determine the expected F2 progeny on the basis of Mendel’s Law of Independent Assortment, which states that the alleles for one gene segregate independently of the alleles for other genes during gamete formation. Record the phenotypes and the phenotype ratio of the F2 generation in lowest terms.arrow_forward
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