The clamshell orchid can have a dorsal sepal that is either bright purple or yellow, and may have ventral sepals that are curly or flat. Assume that each trait is caused by a single gene in which one allele is completely dominant to the other and that these genes are independently assorting. The following table shows the resulting offspring produced by mating parents of the indicated phenotypes. Cross 1 Cross 2 Cross 3 Parent 1 purple, curly purple, flat purple, curly Parent 2 yellow, flat purple, flat yellow, flat purple, curly Which colour (purple or yellow) is the dominant colour? 11 Which sepal shape (curly or flat) is the recessive shape? 20 What would be an appropriate symbol for the purple allele? What would be an appropriate symbol for the yellow allele? What would be an appropriate symbol for the flat allele? 0 What would be an appropriate symbol for the curly allele? Offspring Phenotypes yellow, curly purple, flat 9 59 43 12 7 0 yellow, flat 11 22 0

The clamshell orchid can have a dorsal sepal that is either bright purple or yellow, and may have ventral sepals that are curly or flat. Assume that each trait is caused by a single gene in which one allele is completely dominant to the other and that these genes are independently assorting. The following table shows the resulting offspring produced by mating parents of the indicated phenotypes. Cross 1 Cross 2 Cross 3 Parent 1 purple, curly purple, flat purple, curly Parent 2 yellow, flat purple, flat yellow, flat purple, curly Which colour (purple or yellow) is the dominant colour? 11 Which sepal shape (curly or flat) is the recessive shape? 20 What would be an appropriate symbol for the purple allele? What would be an appropriate symbol for the yellow allele? What would be an appropriate symbol for the flat allele? 0 What would be an appropriate symbol for the curly allele? Offspring Phenotypes yellow, curly purple, flat 9 59 43 12 7 0 yellow, flat 11 22 0

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Description: The clamshell orchid can have a dorsal sepal that is either bright purple or yellow, and may have ventral sepals thatare curly or flat. Assume that each trait is caused by a single gene in which one allele is completely dominant to theother and that

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter8: Patterns Of Inheritance

Section: Chapter Questions

Problem 2ACQ: Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are...

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Individuals of genotype AaBb were mated to individuals of genotype aabb. One thousand offspring were counted, with the following results: 474 Aabb, 480 aaBb, 20 AaBb, and 26 aabb. What type of cross is it? Are these loci linked? What are the two parental classes and the two recombinant classes of offspring? What is the percentage of recombination between these two loci? How many map units apart are they?
More Crosses with Pea Plants: The Principle of Independent Assortment Consider the following cross: P1: AABBCCDDEE aabbccddee F1: AaBbCcDdEe (self-cross to get F2) What is the chance of getting an AaBBccDdee individual in the F2 generation?
Refer to question 4. Assuming complete dominance, the F2 generation will show a phenotypic ratio of _______. a.3:1 b.9:1 c. 1:2:1 d. 9:3:3:1
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?
Sunflowers with flowers 10 cm in diameter are crossed with a plant that has 20-cm flowers. The F1 plants have flowers 15 cm in diameter. In the F2 generation, 4 flowers are 10 cm in diameter and 4 are 20 cm in diameter. Between these are 5 phenotypic classes with diameters intermediate to those at the extremes. a. Assuming that the alleles that contribute to flower diameter act additively, how many genes control flower size in this strain of sunflowers? b. How much does each additive allele contribute to flower diameter? c. What size flower makes up the largest phenotypic class?
The following pedigree shows the pattern of inheritance of red-green color blindness in a family. Females are shown as circles and males as squares; the squares or circles of individuals affected by the trait are filled in black. What is the chance that a son of the third-generation female indicated by the arrow will be color blind if the father is not color blind? If he is color blind?
More Crosses with Pea Plants: The Principle of Independent Assortment Two traits are examined simultaneously in a cross of two pure-breeding pea-plant varieties. Pod shape can be either swollen or pinched. Pea color can be either green or yellow. A plant with the traits swollen and green is crossed with a plant with the traits pinched and yellow, and a resulting F1 plant is self-crossed. A total of 640 F2 progeny are phenotypically categorized as follows: 360 swollen yellow 120 swollen green 120 pinched yellow 40 pinched green a. What is the phenotypic ratio observed for pod shape? Pea color? b. What is the phenotypic ratio observed for both traits considered together? c. What is the dominance relationship for pod shape? Pea color? d. Deduce the genotypes of the P1 and F1 generations.
Given the karyotype shown at right, is this a male or a female? Normal or abnormal? What would the phenotype of this individual be?
In sweet pea plant, an allele for purple flowers (P) is dominant when paired with a recessive allele for red flowers (p). An allele for long pollen grains (L) is dominant when paired with a recessive allele for round pollen grain (l). Bateson and Punnett crossed a plant having purple flowers/long pollen grains with one having white/flowers/round pollen grains. All F1 offspring had purple flowers and long pollen grains. Among the F2 generation, the researchers observed the following phenotypes: 296 purple flowers/long pollen grains 19 purple flowers/round pollen grains 27 red flowers/long pollen grains 85 red flowers/round pollen grains What is the best explanation for these results?
Imagine that you are performing a cross involving seed color in garden pea plants. What traits would you expect to observe in the F1 offspring if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over green. a. only yellow-green seeds b. only yellow seeds c. 1:1 yellow seeds:green seeds d. 1:3 green seeds:yellow seeds
Explain what nondisjunction is, and give two examples of phenotypes that can result from it.
More Crosses with Pea Plants: The Principle of Independent Assortment Consider the following cross in pea plants, in which smooth pea shape is dominant to wrinkled, and yellow pea color is dominant to green. A plant with smooth yellow peas is crossed to a plant with wrinkled green peas. The offspring produced peas that were all smooth and yellow. What are the genotypes of the parents? What are the genotypes of the offspring?