BIOLOGY:DYNAMIC SCIENCE-ACCESS >CUSTOM<
4th Edition
ISBN: 9781337254175
Author: Russell
Publisher: CENGAGE C
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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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Snuffleups are small, ant-eating mammals that live deep in the jungles of Brazil. They possess a nose that varies between 3 inches long and 19 inches long. The exact length of the nose is determined by quantitative loci. If one crosses a 19-inch nosed snuffleup with one that has a 3-inch nose, one gets F1 offspring with 11-inch noses. When one crosses two F1 individuals, one gets an array of nose lengths from 3 inches to 19 inches long. However, among the F2, 3-inch noses occur only about 1 in 256 offspring and 19-inch noses occur about one in 256 offspring.
How many ALLELES are involved in forming this trait?
Snuffleups are small, ant-eating mammals that live deep in the jungles of Brazil. They possess a nose that varies between 3 inches long and 19 inches long. The exact length of the nose is determined by quantitative loci. If one crosses a 19-inch nosed snuffleup with one that has a 3-inch nose, one gets F1 offspring with 11-inch noses. When one crosses two F1 individuals, one gets an array of nose lengths from 3 inches to 19 inches long. However, among the F2, 3-inch noses occur only about 1 in 256 offspring and 19-inch noses occur about one in 256 offspring.
Two 11-inch nosed F1 individuals are crossed. How often will their progeny have noses 9 inches long?
Two 11-inch nosed F1 individuals are crossed. How often will their progeny have noses AT LEAST 15 inches long?
What is the chi-square value of the pumpkin population?
round up and use four decimal points
After doing some crosses and
genotyping some individuals, you determined that the number of individuals homozygous dominant for the largest pumpkin allele is 98, 80 are heterozygous for medium size, and 20 are homozygous
recessive for small size.
Chapter 12 Solutions
BIOLOGY:DYNAMIC SCIENCE-ACCESS >CUSTOM<
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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