Loose-leaf Version for What Is Life? A Guide to Biology 4E & LaunchPad for What is Life? A Guide to Biology 4E (Twelve Month Access)
4th Edition
ISBN: 9781319154639
Author: Jay Phelan
Publisher: W.H. Freeman & Co
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Chapter 9, Problem 5MC
Summary Introduction
Introduction:
A test cross is useful in establishing the genotype of an organism exhibiting the dominant
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A. Consider this cross before answering the following questions:A pea plant heterozygous for the first trait and recessive for the second trait is crossed with a pea plant heterozygous for the first trait and homozygous-dominant for the second trait.
1. If the first gene is demonstrating dominant epistasis to the second gene, what is the probability that the F1 progeny will expressa. the dominant feature for the second trait?b. the recessive feature for the second trait?c. Neither dominant nor recessive features for the second trait?
A. Consider this cross before answering the following questions:A pea plant heterozygous for the first trait and recessive for the second trait is crossed with a pea plant heterozygous for the first trait and homozygous-dominant for the second trait.
1. If the first gene is demonstrating recessive epistasis to the second gene, what is the probability that the F1 progeny will express a. the dominant feature for the second trait?b. the recessive feature for the second trait?c. neither dominant nor recessive features for the second trait?
A. Consider this cross before answering the following questions:
A pea plant heterozygous for the first trait and recessive for the second trait is crossed with a pea plant heterozygous for the first trait and homozygous-dominant for the second trait.
1. If there is complete dominance in the expression of the two traits, what is the probability that the F1 progeny will be
a. heterozygous for the first trait?
b. expressing the dominant feature of the first trait?
c. heterozygous for both first and second traits?
d. expressing recessive feature of the second trait?
e. recessive for both traits
2. It there is incomplete dominance in the expression of the two traits, what is the probability that the F1 progeny will be
a. expressing the dominant feature for the second trait?
b. expressing the dominant feature for both traits?
c. expressing the dominant feature for the first trait and recessive feature for the second?
d. expressing recessive feature for the first trait?
e.…
Chapter 9 Solutions
Loose-leaf Version for What Is Life? A Guide to Biology 4E & LaunchPad for What is Life? A Guide to Biology 4E (Twelve Month Access)
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- A. Consider this cross before answering the following questions:A pea plant heterozygous for the first trait and recessive for the second trait is crossed with a pea plant heterozygous for the first trait and homozygous-dominant for the second trait. 1. It there is incomplete dominance in the expression of the two traits, what is the probability that the F1 progeny will be a. expressing the dominant feature for the second trait?b. expressing the dominant feature for both traits?c. expressing the dominant feature for the first trait and recessive feature for the second?d. expressing recessive feature for the first trait?e. expressing recessive feature for both traits?arrow_forwardDemonstrate how males are at an increased risk of sex-linked recessive traits by crossing a female who is a carrier for Hunter syndrome with a normal male. The genotypes involved are XH, Xh, and Y. State the genotypes and phenotypes of the offspring.arrow_forward. Assuming no involvement of the Bombay phenotype(in case you’ve already read ahead to Section 3.2):a. If a girl has blood type O, what could be the genotypes and corresponding phenotypes of her parents?b. If a girl has blood type B and her mother has bloodtype A, what genotype(s) and correspondingphenotype(s) could the other parent have?c. If a girl has blood type AB and her mother is alsoAB, what are the genotype(s) and correspondingphenotype(s) of any male who could not be thegirl’s father?arrow_forward
- a. State a hypothesis explaining the inheritance of flower color in painted tongues. b. Assign genotypes to the parents, F₁ progeny, and F2 progeny for all five crosses. c. In a cross between true-breeding yellow and true-breeding lavender plants, all of the F1 progeny are bronze. If you used F₁ plants to produce and F2 generation, what phenotypes in what ratios would you expect? Are there any genotypes that might produce a phenotype that you cannot predict from earlier experiments, and if so, how might this alter the phenotypic ratios among the F2 progeny?arrow_forwarda. Determine if the pedigree below can be for a trait that is X-linked traits. Write the genotype of each individual next to the symbol. b. Is it possible that this pedigree is for an X-linked recessive trait? c. What can you conclude about the children if both parents are affected with an X-linked recessive trait?arrow_forwardB. 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 hat both have short-tails.arrow_forward
- a. A variety of fruit bearing plants with the dominant allele A produces cream-coloured fruit while aa plants produce pink or red fruit. Red fruit is produced if allele B is present, and pink fruit is produced when the genotype is bb. What are the expected F2 phenotypes and proportions from intercrossing the F1 offspring of a cross between two plants with the genotype AAbb and aaBB? b. A certain animal can have brown, red, black or gray fur. Assume that fur colour is controlled by a single gene with multiple alleles in a dominance series where black (B1) > brown (B2) > red (B3) > gray (B4). Give the genotypes of two phenotypically different heterozygotes that when crossed produce offspring with the phenotypic ratio of 1 red : 2 black : 1 brown.arrow_forwardA. For the following genotypes state the ABO blood phenotype. JAJA |B|O_ 101⁰_ |A|B_ B. Using genetic diagrams, show how it is possible for a couple with a type A mother and a type B father can have a child with type O blood. C. Using genetic diagrams show how a type AB person with a type O partner have offspring that share neither of their phenotypes.arrow_forwardA. Color-blindness is a recessive, sex-linked disorder in humans. A color- blind man has a child with a woman who is a carrier of the disorder. KEY: X= normal vision XC = color-blindness 2. Illustrate using a Punnett square the probability of having children who will have normal vision and children who will be color-blind. Guide Questions: a. What is the genotype of the male?. b. What is the genotype of the female? c. What is the chance that the child will be color-blind? d. What is the chance that a daughter will be color-blind? e. What is the chance that a son will be color-blind?arrow_forward
- Homozygous dominant parent (PP), and a Homozygous recessive or just simply say recessive parent (pp): a. Fill in the Punnett square. Each box represents a genotype possibility for an offspring. b. Place the allele donated by each parent in the corresponding box. Now list the possible genotypes and their corresponding phenotype. c. If an individual's genotype is heterozygous, the dominant trait will be expressed in the phenotype. Give the percent possible for the phenotypes. P P p p Genotype: ______________ Phenotype: ______________ Phenotype % probable: __________ 2. Cross between a Homozygous dominant parent (PP) and a Heterozygous parent (Pp). Fill in as in step one. 3. Cross between a Heterozygous parent (Pp), and another Heterozygous parent (Pp). Fill-in as before. 4. Test cross: A test cross is between a recessive parent (pp), and a Heterozygous parent…arrow_forwardB. In poinsettias, the gene for red bract color (R) is incompletely dominant over its allele for white bract color (r). Heterozygous individuals have pink bracts. What ratios of bract color would you expect among the following crosses? 1. red x red 2. red x pink 3. white x pink 4. pink x pinkarrow_forwardDistinguish the following terms . A complete dominance and co - dominance B. genotype and phenotypearrow_forward
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