Human Biology (MindTap Course List)
Human Biology (MindTap Course List)
11th Edition
ISBN: 9781305112100
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Chapter 19, Problem 11CT

You decide to breed a pair of guinea pigs, one black and one white. In guinea pigs, black fur is caused by a dominant allele (B) and white is due to homozygosity for a recessive allele (b) at the same locus. Your guinea pigs have seven offspring, four black and three white. What are the genotypes of the parents? Why is there a 1:1 ratio in this cross?

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In a particular lizard species, green skin (G) is dominant to blue skin (g). You decide to cross a lizard (Parent #1) that is homozygous recessive for skin color with a lizard (Parent #2) that is homozygous dominant for skin color. Set up a Punnett Square for this cross and then answer the following questions. What is the genotype of Parent #1? [Choose ] What is the phenotype of Parent #1? [Choose ] What is the gentype of Parent #2? [Choose ] What is the phenotype of Parent #2? [ Choose ] What percentage of the offspring will have [Choose ] blue skin? What percentage of the offspring will have [ Choose ] green skin? > > > > >
A certain cricket species can be green or orange and the difference is determined by alleles of a single gene. You have a true-breeding green cricket line, and cross one of these to an orange cricket of unknown genotype found in the wild. Half the F1 progeny are green and the other half are orange. a. On your own paper, draw by hand a Punnett Square for the cross described above using g to represent the recessive allele and G the dominant allele. Indicate the phenotype of each of the progeny classes in your Punnett Square. b. Draw another Punnett Square illustrating a cross between two F1 orange crickets, again indicating the phenotypes of each progeny class produced. Also indicate the overall proportion of crickets with each phenotype observed in the F2. c. Diagram a cross between an orange F2 cricket and a green cricket from the true-breeding line where the progeny are all orange. Not expecting a Punnett Square here, just something showing the genotypes of both parents. When you are…
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