When mendel performed mono-hybrid crosses with opposing traits (i.e. purple and white flowers), what did he find in the F1 generation? He found an intermediate phenotype that had not been seen before in all of the F1 generation He found that one of the traits was absent from the F1 generation He found that one of the traits was only present in 25% of the F1 generation He found that each trait was found in 50% of the F1 generation

When mendel performed mono-hybrid crosses with opposing traits (i.e. purple and white flowers), what did he find in the F1 generation? He found an intermediate phenotype that had not been seen before in all of the F1 generation He found that one of the traits was absent from the F1 generation He found that one of the traits was only present in 25% of the F1 generation He found that each trait was found in 50% of the F1 generation

Name: 24) When mendel performed mono-hybrid crosses with opposing traits (i.
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Description: 24) When mendel performed mono-hybrid crosses with opposing traits (i.e. purple and white flowers), what did he find in the F1 generation? He found an intermediate phenotype that had not been seen before in all of the F1 generation He found that on

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter12: Mendel's Experiments And Heredity

Section: Chapter Questions

Problem 24CTQ: Mendel performs a cross using a true-breeding pea plant with round, yellow seeds and a true-...

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When Mendel performed mono-hybrid crosses with opposing traits (i.e. purple flowers and white flowers) what did he see in the in F2 generation? He found that the trait that had dissappeared in the F1 generation returned in 25% of the F2 generation He found that both traits continued to be present in 50% of the F2 generation, just like the F1 generation He found that the trait that had dissappeared in the F1 generation returned in 50% of the F2 generation He found that the trait that had dissappeared in the F1 generation returned in 75% of the F2 generation
Consider a cross to investigate the pea pod texture trait, involving constricted or inflated pods. Mendel found that the traits behave according to a dominant/ recessive pattern in which inflated pods were dominant. If you performed this cross and obtained 650 inflated-pod plants in the F2 generation, approximately how many constricted-pod plants would you expect to have? 600 165 217 468
Hemophilia and color blindness are both recessive conditions caused by genes on the X chromosome. To calculate the recombination frequency between the two genes, you draw a large number of pedigrees that include grandfathers with both hemophilia and color blindness, their daughters (who presumably have one chromosome with two normal alleles and one chromosome with two mutant alleles), and the daughters sons. Analyzing all the pedigrees together shows that 25 grandsons have both color blindness and hemophilia, 24 have neither of the traits, 1 has color blindness only, and 1 has hemophilia only. How many centimorgans (map units) separate the hemophilia locus from the locus for color blindness?
Two pairs of traits are segregating in a cross. Two parents produce 156 progeny that fall into 4 phenotypes. The numbers of offspring in the 4 phenotypes are 89, 31, 28, and 8. What are the genotypes of the two parents?
Mendel performs a cross using a true-breeding pea plant with round, yellow seeds and a true- breeding pea plant with green, wrinkled seeds. What is the probability that offspring will have green, round seeds? Calculate the probability for the F1 and F2 generations.
The text outlines some of the problems Frederick William I encountered in his attempt to breed tall Potsdam Guards. a. Why were the results he obtained so different from those obtained by Mendel with short and tall pea plants? b. Why were most of the children shorter than their tall parents?
Two linked loci have a recombination frequency of 5%. A series of crosses is performed. The P generation includes an individual that is homozygous dominant for trait 1 and homozygous recessive for trait 2. The second individual is homozygous recessive for trait 1 and homozygous dominant for trait 2. The F1 generation is crossed with individuals that are homozygous recessive for both traits. If 400 F2 offspring are produced, how many offspring with each phenotype are expected? Fill in the table below with your answers. Phenotype Number of Offspring Predicted Recessive 1, Recessive 2 Dominant 1, Dominant 2 Recessive 1, Dominant 2 Dominant 1, Recessive 2 Total offspring 400 For the results above, determine which phenotypes are parental and which are recombinant. Phenotype Parental or Recombinant? Dominant 1, Dominant 2 Recessive 1, Dominant 2 Recessive 1, Recessive 2 Dominant 1, Recessive 2
1) 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) What would be the size and genotype of the F1 from a cross between a true-breeding 11 cm plant and a true-breeding 47 cm plant? b) The F1 from (b) is then crossed to give an F2. What proportion would you expect in the F2 of each extreme phenotype? c) In a cross between a 29cm plant and a 20cm plant what would be the genotypes giving the smallest number of different phenotypes? specify the phenotypes observed.
1. Mendel obtained his initial pea plant varieties from local breeders who were developing new varieties that might be useful or interesting. To generate these new varieties, breeders formed hybrids between existing varieties of different phenotypic characteristics by cross pollination, using techniques they doubtless taught to Mendel. After producing a hybrid, they allowed several generations of self-pollination, as happens naturally if the flowers are not disturbed. a. How many generations would it take for a breeder to have produced new pure-breeding varieties using this approach? iv. What is the probability that an individual in each of these generations (F2, F3, and F10) would be homozygous for one or the other allele of this gene? [Broad hint: if they’re not heterozygous, they’re homozygous!]
1. During his study of the rare Idlewild Lady Slipper (a wild orchid), Dr. Jorge Whiteback discovered several variants of the typical "wild-type" phenotype. He found two varieties of lady slippers at different elevations: a lady slipper variety found in the valley with red flowers and a lady slipper found at higherelevations with white flowers. When Dr. Whiteback did controlled crosses between lady slippers with red flowers and lady slippers with white flowers, all the offspring of this cross had pink flowers. After allowing pinkflowering lady slippers to self-fertilize, the next generation of plants had 112 red flowering plants, 218 pink flowering plants, and 108 white flowering plants.1a) What mode of inheritance would best explain the results of Dr. Whiteback's crosses?b) How many genes and how many different alleles of these gene(s) are determining flower coloraccording to your mode of inheritance?c) Define alleles using the appropriate notation for your answer in (a) and use that…
2 Considering the Mendelian traits round versus wrinkled and yellow versus green, consider the crosses below and determine the genotypes of the parental plants by analyzing the phenotypes of their offspring. Parental Plants Offspring (a) round, yellow * round, yellow 3/4 round, yellow 1/4 wrinkled, yellow (b) wrinkled, yellow * round, yellow 6/16 wrinkled, yellow 2/16 wrinkled, green 6/16 round, yellow 2/16 round, green (c) round, yellow * round, yellow 9/16 round, yellow 3/16 round, green 3/16 wrinkled, yellow 1/16 wrinkled, green (d) round, yellow * wrinkled, green 1/4 round, yellow 1/4 round, green 1/4 wrinkled, yellow 1/4 wrinkled, green
b. What if a breeder were working with 7 different, independently segregating genes, as Mendel did? How many generations would it take him to have pure-breeding varieties, starting from an F1 hybrid that is heterozygous for all 7 genes? i. What is the probability that an individual in the F2 generation would be pure-breeding (i.e. is homozygous at all 7 loci)? [Hint: this is an “and” calculation since it must be homozygous at each of the 7 loci. ii. What is the probability that an individual in the F3 generation would be pure-breeding? iii. What is the probability that an individual in the F10 generation would be pure-breeding?

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		He found an intermediate phenotype that had not been seen before in all of the F1 generation
		He found that one of the traits was absent from the F1 generation
		He found that one of the traits was only present in 25% of the F1 generation
		He found that each trait was found in 50% of the F1 generation