Biology: Life on Earth Plus Mastering Biology with Pearson eText -- Access Card Package (11th Edition)
11th Edition
ISBN: 9780134153742
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Chapter 11, Problem 5MC
A test cross is used to determine
a. the genotype of an organism with a
b. the genotype of an organism with a phenotypically recessive trait.
c. the genotype of an organism showing pleiotropic effects of a gene.
d. if a trait is inherited polygenically.
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A fungus with white spores cross fertilizes a fungus with black spores. If 10% of the progeny bear white spores while 90% of the progeny bear black spores, what must be true?
A.
The trait for spore color is determined by exactly one gene.
B.
The trait for spore color is determined by more than one gene.
C.
The allele for black spores is dominant over that for white spores.
D.
The allele for white spores is dominant over that for black spores.
Fruit flies are very useful model organisms that have been used to study genetics. One mutant recessive trait in fruit flies is called "eyeless" because it causes flies to have no eyes. Cross an eyeless fly with a homozygous normal fly.
a. Draw the Punnett square.
b. What is the genotyoe ratio of the offspring?
c. What is the phenotype ratio of the offspring?
d. What genetic problem is this? (monohybrid, dihybrid or multiple allele)
What does a Punnett square illustrate?
A.
The phenotypes of all offspring in a test cross.
B.
The genotypes of all possible offspring in a test cross.
C.
The phenotypes of all possible offspring in a test cross.
D.
The genotypes and phenotypes of all possible offspring in a test cross.
Chapter 11 Solutions
Biology: Life on Earth Plus Mastering Biology with Pearson eText -- Access Card Package (11th Edition)
Ch. 11 - The physical position of a gene on a chromosome is...Ch. 11 - If an organism has two different alleles (call the...Ch. 11 - Independent assortment means that a. two genes...Ch. 11 - If a gene is located on the X chromosome of a...Ch. 11 - 5. A test cross is used to determine
a. the...Ch. 11 - An organism is described as Rr, with red coloring....Ch. 11 - 2. The inheritance of multiple traits depends on...Ch. 11 - Prob. 3FTBCh. 11 - 4. Genes that are present on one sex chromosome...Ch. 11 - 5. When the phenotype of heterozygotes is...
Ch. 11 - 1. Define the following terms: gene, allele,...Ch. 11 - 2. Explain why genes located on the same...Ch. 11 - 3. Define polygenic inheritance. Why does...Ch. 11 - What is sex linkage? In mammals, which sex would...Ch. 11 - What is the difference between a phenotype and a...Ch. 11 - 6. In the pedigree of part (a) of Figure 11–22, do...Ch. 11 - Sometimes the term gene is used rather casually....Ch. 11 - In an alternate universe, all the genes in all...
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- Imagine a test cross for an unknown exhibiting 2 traits, where half of the offspring exhibit both dominant traits and the other half exhibits one dominant and one recessive trait. What can you conclude about the unknown? options: A) The unknown is homozygous dominant for both traits. B) The unknown is homozygous recessive for both traits. C) The unknown is heterozygous for both traits. D) The unknown is homozygous for one gene and heterozygous for the other. E) There is not enough information to determine the answer.arrow_forwardWhich of the following CANNOT be true about the inheriteance the trait depicted in the pedigree diagram below? A. It is recessive B. It is dominant C. It is on the X chromosome D. It is recessive, and it is on the X chromosomearrow_forwardA) what are the genotypes for EB27 and EB67? B) what is the relationship between the three alleles (B,br, y)? Show evidence using the pedigreearrow_forward
- (a) What is the similarity between type A and AB blood groups? (b) If the dominant allele of a trait is defined with ‘E’ and the recessive trait is defined with ‘e’, what will be the homozygous dominant allele combination of the trait? (c) What is a dihybrid cross?arrow_forwardHow can a polygenic trait be easily identified? a. There ae only two possible phenotypes for the trait. b. The graphing of the possible phenotypes results in a bell curve. c. The presence of the polygenic trait masks the other possible alleles involved. d. The environment has a greater influence on the trait.arrow_forwardWhich are the following are TRUE for test crosses? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a They are useful when the genotype of a dominant phenotype is unknown. b They are always done by crossing the dominant phenotype to a homozygous recessive individual for that trait. c This test is always done in humans. d A + B e A + C f B + Carrow_forward
- Solve the following: In a pedigree, all the members of onefamily are affected. Based on this knowledge, list thegenotypes of the parents (a) if the trait is recessive and(b) if the trait is dominant.arrow_forwardA particular person is said to be a carrier of a genetic trait. What does this tell you about their phenotype? (a) They physically show the trait. (b) They physically show the trait more than a noncarrier would show the trait.(c) They are almost normal but show an intermediate phenotype for the trait. (d) They are completely normal and do not physically show the trait.arrow_forwardA fungus with white spores cross fertilizes a fungus with black spores. If 10% of the progeny bear white spores while 90% of the progeny bear black spores, what must be true? A. The trait for spore color is determined by exactly one gene. B. The trait for spore color is determined by more than one gene. C. The allele for black spores is dominant over that for white spores. D. The allele for white spores is dominant over that for black spores. Photo attatchedarrow_forward
- In a particular plant species, a cross between pure breeding strains both of which have white flowers produces F1 progeny with purple flowers. The F2 generation subsequently produced resulted in 450 plants with purple flowers and 350 with white flowers. a) State the phenotypic ratio in the F2 progeny. b) Deduce the genotype of purple F2 plants. c) Deduce the genotype of F1 plants. d) Deduce the genotype of two parental plants.arrow_forwardWhat is the reason for doing a test cross?a. to identify heterozygous individuals with the dominant phenotypeb. to determine which allele is dominant and which is recessivec. to identify homozygous recessive individuals in the F2d. to determine if two genes assort independentlyarrow_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_forward
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