BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Textbook Question
Chapter 13, Problem 14SA
The phenotype of individuals heterozygous for ________ alleles comprises both homozygous
a. epistatic | c. pleiotropic |
b. codominant | d. hybrid |
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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.
A dog breeder liked yellow and brown Labrador retrievers. In an attempt to produce yellow and brown puppies, he mated a yellow Labrador male and a brown Labrador female. Unfortunately, all the puppies produced in this cross were black. a. Explain this result. b. How might the breeder go about producing yellow and brown Labradors?
a. Is the trait indicated by the solid symbols inherited in a dominant or recessive manner? (2)
b. Give a definitive reason for your answer in (a). (This reason should not be skips a generation or doesn’t skip a generation).
c. Assign genotypes for individuals III-3 in both pedigrees.
Chapter 13 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Ch. 13 - A heterozygous individual has _______ for a trait...Ch. 13 - An organisms observable traits constitute its...Ch. 13 - In genetics, F stands for filial, which means...Ch. 13 - The offspring of the cross AAaa are ________. a....Ch. 13 - The second-generation offspring of a cross between...Ch. 13 - Refer to question 4. Assuming complete dominance,...Ch. 13 - Independent assortment means _______. a. alleles...Ch. 13 - A testcross is a way to determine _________. a....Ch. 13 - Assuming complete dominance, crosses between two...Ch. 13 - The probability of a crossover occurring between...
Ch. 13 - True or false? All traits are inherited in a...Ch. 13 - One gene that affects three traits is an example...Ch. 13 - ________ in a trait is indicated by a bell curve.Ch. 13 - The phenotype of individuals heterozygous for...Ch. 13 - Match the terms with the best description. ___...Ch. 13 - Mendel crossed a true-breeding pea plant with...Ch. 13 - Assuming that independent assortment occurs during...Ch. 13 - Determine the predicted genotype frequencies among...Ch. 13 - Prob. 4GPCh. 13 - A single allele gives rise to the HbS form of...Ch. 13 - In sweet pea plant, an allele for purple flowers...
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- What is the reason for doing a test cross? a. to identify heterozygous individuals with the dominant phenotype b. to determine which allele is dominant and which is recessive c. to identify homozygous recessive individuals in the F2 d. to determine if two genes assort independentlyarrow_forwardGregor mendels experiments sought to discover if he could find the rules that govern A. Genetics B. Heredity C. Meiosis D. Mutationsarrow_forwardCompare and Contrast the following; a. Hybrid vs. intermediate b. Gene vs. allele c. Dominance vs. recessive d. Genotype vs. phenotypearrow_forward
- . A man with a blood type AB is married to a woman with blood type A. They have natural children and one adopted child. These are the children with their blood type: Baltazar has blood type A, Melchor has blood type AB and Melchor has blood type O. a. Who was adopted? b. What genetic problem is this? (monohybrid, dihybrid or multiple allele) c. Show the Punnett square.arrow_forwardMendel's pea plants were a good choice for studying heredity, because: a) They have lots of easily observable traits that vary in an either-or manner. b) Their mating is uncontrollable. c) There are separate male and female plants. d) The plants are incapable of cross-pollination.arrow_forwardInbreeding is sexual reproduction between individuals that are a. homozygous. b. heterozygous. c. part of the same genetic lineage. d. both a and c.arrow_forward
- if your phenotype is for a dominant trait, such as curly hair, then your genotype is? a: also for curly hairb: for both curly and straight hair c: a complex combination of all hair typesd: unknown, the alleles could be heterozygous or homozygousarrow_forwardA plant that is homozygous for the recessive yellow pod color is crossed with a plant that is heterozygous. Which phenotype will appear MOST in the offspring? A. There will only be plants with green pods. B. There will be more plants with green pods. C. There will be more plants with yellow pods. D. Plants with yellow and green pods will appear in equal numbers.arrow_forwardTay–Sachs disease is caused by recessive alleles on anautosome. In which case(s) could two parents with anormal phenotype have a child with Tay–Sachs?a. Both parents are homozygous for a Tay–Sachs allele.b. Both parents are heterozygous for a Tay–Sachsallele.c. One parent is homozygous for a Tay–Sachs allele,and the other is heterozygous.arrow_forward
- A cross between two pea plants with genotypes PpLI and PpLI results in an F1 generation that is 25% PPLL, 50% PpLI, and 25% ppll. Which reason most likely explains why other possible genotypes are not present? Choose 1 answer. A.The genes underwent independent assortment B.The loci of the genes are close together. C.The loci of the genes are on different chromosomes. D.Crossing over occurred between chromosomes.arrow_forwardUsing the pedigree chart, explain: a) The number of generations seen. b) If all blue-coloured shapes are affected with disease X- how many males are affected? how many females are affected? c) Does this disease have a dominant or recessive inheritance pattern? Justify your answer.arrow_forwardIn guinea pigs, black fur is dominant over white fur. If a homozygous dominant guinea pig were crossed with a homozygous recessive guinea pig, the first generation of offspring would _____. Select all that apply. a be heterozygous b be phenotypically identical c have all black fur d have half black fur and half white fur e be homozygousarrow_forward
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