Introduction To Genetic Analysis
12th Edition
ISBN: 9781319114787
Author: Anthony J.F. Griffiths, John Doebley, Catherine Peichel, David A. Wassarman
Publisher: W. H. Freeman
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Chapter 1, Problem 2P
Summary Introduction
To determine: The deviation from the ratio of 3:1 in white-purple colored flower.
Introduction. The dominant allele masks the expression of the recessive allele. Therefore the dominant allele is expressed in homozygous and heterozygous genotype while the recessive
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Gray seed color in peas is dominant to white. Assume that Mendel conducted a series of experiments where plants with gray seeds were crossed with each other and the following progeny were produced: 320 gray and 80 white. (a) What is the most probable genotype of each parent? (b) Based on your answer in (a) above, what genotypic and phenotypic ratios are expected in the progeny?
Mendel found that round (R) seed is dominant over wrinkled (r) seed, and yellow (G) seed is
dominant over green (g) seed. The following crosses were made between plants of known
phenotypes but unknown genotypes:
1) round, yellow X round, yellow
2) round, yellow X round, yellow
3) round, yellow X wrinkled, green
b)
Cross
1
2
Using the same symbols as defined above, list the genotypes of the parent plants in
each cross.
3
round, yellow X round, yellow
round, yellow X round, yellow
round, yellow X wrinkled, green
Which of the above crosses is a testcross?
Offspring and ratio
3/4 round, yellow
1/4 wrinkled, yellow
9/16 round, yellow
3/16 round green
3/16 wrinkled, yellow
1/16 wrinkled, green
MacBook Pro
1/4 round, yellow
1/4 round, green
1/4 wrinkled, yellow
1/4 wrinkled, green
Focu
In one of Mendel’s dihybrid crosses, he observed315 round, yellow; 108 round, green; 101 wrinkled,yellow; and 32 wrinkled, green F2 plants. Analyze thesedata using the x2 test to see if(a) they fit a 9:3:3:1 ratio.(b) the round:wrinkled data fit a 3:1 ratio.(c) the yellow:green data fit a 3:1 ratio.
Chapter 1 Solutions
Introduction To Genetic Analysis
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Mendel crossed true-breeding plants with wrinkled and green peas to true breeding plants with round and yellow peas. Then he crossed the Fl plants to true-breeding plants with wrinkled, green peas and observed in the progeny 31 plants with round, yellow peas, 26 plants with round, green peas, 27 plants with wrinkled, yellow peas, and 26 with wrinkled, green peas. a) What proportion of these four phenotypes would be expected? b) Calculate the appropriate chi-square and determine if it is consistent with Mendelian expectations (be sure to indicate the probability range).arrow_forwardWhich of the following is evidence that Mendel had that helped him to construct his Law of Segregation?A) His F2 generation in the dihybrid cross resulted in a 1:1:1:1 distribution of phenotypes.B) He found no linkage of different genes in the offspring of his pea plants.C) The F1 generation of the monohybrid cross resulted in blended phenotypes.D) The F2 generation of the monohybrid cross resulted in the recessive trait reappearing as a phhenotype.E) Two of the above are correct.arrow_forwardRough coat (R) is dominant over smooth coat (r) in guinea pigs, and black coat (B) is dominant over white (b). This pair of contrasting traits obeys both of Mendel’s laws. If a homozygous rough black is mated with a homozygous smooth white, give the appearance of each of the following: F1; F2; offspring of F1 mated with smooth, white parent; offspring of F1mated with rough, black parent.arrow_forward
- What was the second filial (F2) generation in Mendel's experiment?arrow_forwardIn one of his experiments, Mendel crossed homozygous yellow plants with homozygous green plants. The resulting F1 generation was allowed to self-fertilize. The F2 generation produced 930 yellow seeds and 305 green seeds. What are the genotypes of this F2 generation? O YY : yy O Yy : yy O Yy: yy O YY: Yy : yyarrow_forwardA cross is performed between a pure-breeding pea plant with round and yellow seeds and a pure-breeding pea plant with wrinkled and green seeds. All F1 progeny have round and yellow seeds. The F1 plants are self-crossed. The following results are observed in the resultant F2 generation: 65 round and yellow, 42 round and green, 50 wrinkled and yellow, and 45 wrinkled and green. Use a Chi Square analysis to determine whether these traits follow Mendel’s law of independent assortment. Show all calculationsarrow_forward
- What are the genotypes and phenotypes for Mendel’s true-breeding parent plants?arrow_forwardQ6. Guinea pigs, which were homozygous for long, black hair were crossed with ones which were homozygous for short, white hair. All the F1 offspring had short, black hair. (a) Using suitable symbols, draw a genetic diagram showing parents genotypes, to explain this result in F1 offspring. (b) Complete the Punnett square to show the results of interbreeding the F1 offspring. Gametesarrow_forwardIn the results that Mendel obtained, the violet colored flower was dominant to the white flower (which was recessive). What do these terms (dominant and recessive) mean?arrow_forward
- When Mendel examined the inheritance of seed colour, he crossed true-breeding green -seeded and true-breeding yellow-seeded plants. All of the plants produced were yellow- seeded. He then crossed the yellow-seeded plants and found that some of the offspring were green-seeded and some were yellow-seeded. What were the genotypes of the F2 offspring? Yy and Yy yellow green and Yy yellow and green Yy, YY and yyarrow_forwardMendel discovered that pea traits were inherited as unit factors occurring in pairs, these distributing to subsequent generations randomly through the gametes. The unit factors would not have been paired ifA) the temperature had been differentB) pea plants had not been diploidC) peas had been self-fertileD) The statement is false: unit factors occur singly in Mendel’s sweet peasE) The statement is false: unit factors occur in sets of three in Mendel’s sweet peas Which of the following statements about the theory of epigenesis is incorrect? A) William Harvey was its main proponent back in the 1500s and 1600s.B) It recast the focus of life to the egg, away from male contributions which had dominated theory for centuriesC) It was incompatible with the notion of preformationism, which had been popular for some timeD) It suffered from teleological notions in that it argued that the organism developed with a certain drive in a certain direction as if it knew where it was going or had a…arrow_forwardWhat was the parental (P) generation in Mendel's experiment?arrow_forward
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