Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 12, Problem 3ITD
Half of the world’s population eats rice at least twice a day. Much of this rice is grown in flooded conditions, and different strains of rice are tolerant (survive) or intolerant (die) under these conditions. Rice breeders used genetic crosses to test whether tolerance to flooding is a dominant trait. Researchers used three true-breeding flood-tolerant strains, FR143, BKNFR, and Kurk, and two true-breeding flood- intolerant strains, IR42 and NB, in the crosses. Results were obtained from three sets of crosses and are reported in the Table below:
Results of cross of F1 to tolerant parent: F1 plants were crossed with the tolerant parent of the cross.
| Number of Plants | |||
| Progeny Analyzed from Intolerant × Tolerant Cross | Alive | Dead | Total |
| 1. F2 results of cross: | |||
| IR42 × FR13A | 187 | 77 | 264 |
| IR42 × BKNFR | 192 | 73 | 265 |
| NB × Kurk | 142 | 52 | 195 |
| 2. Results of cross of F1 to intolerant parent: | |||
| (F1 of IR42 × FR13A) × IR42 | 14 | 17 | 31 |
| (F1 of IR42 × BKNFR) × IR42 | 15 | 10 | 25 |
| (F1 of NB × Kurk) × NB | 21 | 35 | 56 |
| 3. Results of cross of F1 to tolerant parent: | |||
| (F1 of IR42 × FR13A) × FR13A | 31 | 0 | 31 |
| (F1 of IR42 × BKNFR) × BKNFR | 28 | 0 | 28 |
| (F1 of NB × Kurk) × Kurk | 40 | 0 | 40 |
Do the data support the hypothesis that the tolerance trait is dominant? Justify your conclusion by explaining the results from each of the three sets of crosses in terms of genotypes and
Source: T. Setter et al. 1997. Physiology and genetics of submergence tolerance in rice. Annals of
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Chapter 12 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 12.1 - Two pairs of traits are segregating in a cross....Ch. 12.1 - If, instead, the four phenotypes in question 1...Ch. 12.2 - Palomino horses have a golden coat color, with a...Ch. 12.2 - A true-breeding rabbit with agouti (mottled,...Ch. 12 - The dominant C allele of a gene that controls...Ch. 12 - In peas, the allele Le produces tall plants and...Ch. 12 - Prob. 3TYKCh. 12 - What genotypes, and in what frequencies, will be...Ch. 12 - In addition to the two genes in problem 4, assume...Ch. 12 - Prob. 6TYK
Ch. 12 - In cats, the genotype AA produces tabby fur color;...Ch. 12 - Prob. 8TYKCh. 12 - The ability of humans to taste the bitter chemical...Ch. 12 - A man is homozygous dominant for alleles at 10...Ch. 12 - In guinea pigs, an allele for rough fur (R) is...Ch. 12 - Prob. 12TYKCh. 12 - Some recessive alleles have such a detrimental...Ch. 12 - In chickens, feathered legs are produced by a...Ch. 12 - A mix-up in a hospital ward caused a mother with O...Ch. 12 - Having malformed hands with shortened fingers is a...Ch. 12 - Prob. 17TYKCh. 12 - Design an Experiment Imagine that you are a...Ch. 12 - Prob. 19TYKCh. 12 - Prob. 1ITDCh. 12 - Prob. 2ITDCh. 12 - Half of the worlds population eats rice at least...
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