Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 2, Problem 8CONQ
Summary Introduction
To review:
The ratios of the offspring genotypes and
Introduction:
A genotype is the representation of the genetic complement of an organism, with respect to one or more characters. A phenotype is the observable morphological characters of an individual, which is the expressible form of genotype. Tallness/dwarfness, the red/pink/white colors of a flower are all its phenotypic traits, whereas TT/Tt, RR/Rr/rr are their genotypes, respectively.
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In Japanese four o'clock plants red (R) color is incompletely dominant over white (r) flowers, and the heterogynous condition (Rr) results in plants with pink flowers. Construct a punnett square and give phenotypic and genotype ratios of the offspring for the following cross a red plant and a white plant
For a cross between a heterozygous tall pea plant and a dwarf plant, predict the ratios of genotypes and phenotypes in the offspring.
In a cross between a heterozygous tall pea plant and a dwarf plant,predict the ratios of the offspring’s genotypes and phenotypes.
Chapter 2 Solutions
Genetics: Analysis and Principles
Ch. 2.1 - 1. Experimental advantages of using pea plants...Ch. 2.1 - The term cross refers to an experiment in which a....Ch. 2.1 - 3. To avoid self-fertilization in his pea plants,...Ch. 2.2 - Prob. 1COMQCh. 2.2 - Prob. 2COMQCh. 2.3 - A pea plant has the genotype rrYy. How many...Ch. 2.3 - A cross is made between a pea plant that is RrYy...Ch. 2.3 - Prob. 3COMQCh. 2.4 - Which of the following would not be observed in a...Ch. 2.4 - Prob. 2COMQ
Ch. 2.5 - A cross is made between AABbCcDd and AaBbccdd...Ch. 2.5 - Prob. 2COMQCh. 2.5 - Prob. 3COMQCh. 2 - 1. Why did Mendel’s work refute the idea of...Ch. 2 - 2. What is the difference between...Ch. 2 - 3. Describe the difference between genotype and...Ch. 2 - 4. With regard to genotypes, what is a...Ch. 2 - 5. How can you determine whether an organism is...Ch. 2 - In your own words, describe Mendels law of...Ch. 2 - Based on genes in pea plants that we have...Ch. 2 - Prob. 8CONQCh. 2 - Do you know the genotype of an individual with a...Ch. 2 - 10. A cross is made between a pea plant that has...Ch. 2 - Prob. 11CONQCh. 2 - 12. Describe the significance of nonparentals with...Ch. 2 - For the following pedigrees, describe what you...Ch. 2 - Ectrodactyly, also known as lobster claw syndrome,...Ch. 2 - Identical twins are produced from the same sperm...Ch. 2 - In cocker spaniels, solid coat color is dominant...Ch. 2 - A cross was made between a white male dog and two...Ch. 2 - 18. In humans, the allele for brown eye color (B)...Ch. 2 - Albinism, a condition characterized by a partial...Ch. 2 - A true-breeding tall plant was crossed to a dwarf...Ch. 2 - 21. For pea plants with the following genotypes,...Ch. 2 - 22. An individual has the genotypeand makes an...Ch. 2 - 23. In people with maple syrup urine disease, the...Ch. 2 - Prob. 24CONQCh. 2 - 25. A true-breeding pea plant with round and Page...Ch. 2 - Prob. 26CONQCh. 2 - 27. What are the expected phenotypic ratios from...Ch. 2 - Prob. 28CONQCh. 2 - Prob. 29CONQCh. 2 - A pea plant that is dwarf with green, wrinkled...Ch. 2 - 31. A true-breeding plant with round and green...Ch. 2 - Wooly hair is a rare dominant trait found in...Ch. 2 - Huntington disease is a rare dominant trait that...Ch. 2 - 34. A woman with achondroplasia (a dominant form...Ch. 2 - 1. Describe three advantages of using pea plants...Ch. 2 - Explain the technical differences between a...Ch. 2 - 3. How long did it take Mendel to complete the...Ch. 2 - 4. For all seven characters described in the data...Ch. 2 - From the point of view of crosses and data...Ch. 2 - 6. As in many animals, albino coat color is a...Ch. 2 - 7. The fungus Melampsora lini causes a disease...Ch. 2 - For Mendels data for the experiment in Figure 2.8,...Ch. 2 - 9. Would it be possible to deduce the law of...Ch. 2 - In fruit flies, curved wings are recessive to...Ch. 2 - A recessive allele in mice results in an unusally...Ch. 2 - Prob. 12EQCh. 2 - Prob. 13EQCh. 2 - Prob. 14EQCh. 2 - 15. A cross was made between two strains of plants...Ch. 2 - A cross was made between two pea plants, TtAa and...Ch. 2 - Consider this four-factor cross: TtRryyAaTtRRYyaa,...
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- In Minx cats, the alleles TT yield a cat with a normal tail, the heterozygous alleles Tt yield a cat with a short tail or no tail at all, and the recessive alleles tt are lethal to the embryo. Using Punnett squares, determine the genotypes and phenotypes of all offspring from parent Minx cats that both have short-tails.arrow_forwardUse a Punnett square to predict the offspring in a cross between a tall pea plant (heterozygous) and a tall pea plant (heterozygous). What is the genotypic ratio of the offspring?arrow_forwardSuppose the ear length of two populations of jerboas is controlled by one gene. To determine the mode of inheritance, a homozygous short-eared female is crossed with a homozygous long-eared male. Then, siblings from the F₁ are crossed, and the number of short- and long-eared animals are counted to determine the phenotype ratio. Match the phenotypic ratio anticipated in the offspring from a cross of two heterozygous individuals to the appropriate mode of inheritance for the short-ear allele. Mode of inheritance F1 phenotype Cross of heterozygotes 1 long : 3 short Autosomal dominant Autosomal recessive Sex-linked dominant Sex-linked recessive All short-eared 1 long : 1 short All long-eared Answer Bank All short-eared males 1 long : 1 short; females all short 3 long : 1 short Long-eared females, short-eared malesarrow_forward
- Show the cross between a heterozygous purple flowered pea plant and a white flowered pea plant. What is the genotypic ratio of the above cross? What is the phenotypic ratio of the above cross?arrow_forwardGive typed explanation : In peas, tall (T) is dominant to short (t). A homozygous tall plant is crossed with a short plant. The F1 are self-fertilized to produce the F2. Both tall and short plants appear in the F2. If the tall F2 are self-fertilized, what types of offspring and proportions will be produced?arrow_forwardCross the two individual heterozygous for two traits found in two different chromososmes. These two individuals have the following genes: G=yellow pea; g=green pea; W smooth pea; w wrinkled pea. GgWwxGgWw A.give the phenotypes of their offsprings with their specific probabilities and phenotypic ratio B.write the genotypes of their offsprings with their probabilities and give the genotypic ratio Hint GgxGg=1/4 GG+1/2Gg+1/4=3/4+1/4g WwxWw=1/4WW+1/2Ww+1/4ww=3/4W+1/4warrow_forward
- Use Instructions above please Purple flowers are dominant over white flowers, and green pods are dominant over yellow pods in pea plants. What would the probability be of producing a pea plant with white flowers and yellow pods from parent plants that are heterozygous for each trait?arrow_forwardDraw a table that shows all possible combinations of offspring resulting from a dihybrid cross of pea plants that are heterozygous for the tall/dwarf and inflated/constricted allele.arrow_forwardUse a punnett square in fruit flies, red eyes (r) are dominant to pink eyes (r). what is the phenotypic ratio of a cross between a heterozygous male and a pink-eyed femalearrow_forward
- A pea plant is heterozygous for both pod shape and color. I is the allele for dominant, inflated pod; i is the allele for recessive, constricted pod. G is the allele for dominant, green pod; g is the allele for recessive, yellow color characteristic. Suppose this plant is crossed with a homozygous pea with inflated, green pod, what will be the possible genotype of the offspring? Construct the punnet square, then identify the following: 1. Parents’ genes?2. Parents’ traits?3. Genes (genotype)?4. Shape, color? (phenotype)?5. Genotypic ratio?6. Phenotypic ratio?arrow_forwardThe height of a certain plant is determined by a dominant allele T corresponding to tall plants, and a recessive allele t corresponding to short (or dwarf) plants. If both parent plants have genotype Tt, compute the probability that the offspring plants will be tall. Hint: Draw a Punnett square.arrow_forwardIn rabbits, white coat color (CW) and black coat color (CB) are codominant, and both of these alleles are dominant over albino (c); heterozygotes (CWCB) are spotted. Predict the genotypes and phenotypes of the offspring from a heterozygous black-coated rabbit and a homozygous white-coated rabbit.arrow_forward
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