Human Biology Custom Edition
11th Edition
ISBN: 9781337631532
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
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?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
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…
You are working for a parakeet breeder that has some green birds and some blue birds. You
want to determine which feather color is dominant. You cross a blue male to each of two
green females. In the first cross, the blue male is crossed to a green female named Gabby,
resulting in 2 green and 2 blue offspring. In the second cross, the same blue male is
crossed to a green female named Gail, resulting in 5 green offspring. Based on these
results:
●
[Select]
phenotype is dominant.
• Gail's genotype is [Select]
The cross between the male and Gabby is called a [ Select]
cross.
Chapter 19 Solutions
Human Biology Custom Edition
Ch. 19 - Define the difference between (a) gene and allele,...Ch. 19 - Prob. 2RQCh. 19 - What is probability, and how is it applied in...Ch. 19 - What is independent assortment? Does independent...Ch. 19 - Alleles are ___________. a. alternate forms of a...Ch. 19 - A heterozygote has _____. a. only one of the...Ch. 19 - Prob. 3SQCh. 19 - Offspring of a cross AA aa are ______. a. all AA...Ch. 19 - Prob. 5SQCh. 19 - Prob. 6SQ
Ch. 19 - Which statement best fits the principle of...Ch. 19 - Prob. 8SQCh. 19 - Prob. 9SQCh. 19 - Prob. 10SQCh. 19 - One gene has alleles A and a. Another has alleles...Ch. 19 - Still referring to Problem 1, what will be the...Ch. 19 - Go back to Problem 1, and assume you now study a...Ch. 19 - The young woman shown at right has albinismvery...Ch. 19 - When you decide to breed your Labrador retriever...Ch. 19 - The ABO blood system has been used to settle cases...Ch. 19 - Prob. 7CTCh. 19 - A man is homozygous dominant for ten different...Ch. 19 - Prob. 9CTCh. 19 - Bill and Marie each have flat feet, long...Ch. 19 - You decide to breed a pair of guinea pigs, one...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- A black guinea pig is mated to a white guinea pig, and they produce 12 black offspring Then, the same white guinea pig is mated to a different black guinea pig, and they produce 7 black and 5 white offspring. What is the best explanation for the difference between these two matings? In your answer, you must include genotypes for the parents and offspring of each cross.arrow_forwardA genetic engineer is going to cross two watermelon plants to produce seeds for a spring planting. He is breeding for size, and wants to have as many watermelons with the phenotype for long shape as possible. In watermelons, the allele for short shape (R) is dominant to the allele for long shape (r). Would crossing a watermelon homozygous recessive for the trait with a watermelon heterozygous for the trait give the most long watermelons possible? Explain your answer using Punnett Squares.arrow_forwardProfessor John decided to breed bunnies during stay-at-home because why not. She performed the following cross:Parents:brown fur, gray nose x white fur, gray noseOffspring:3/8 white fur, gray nose1/8 white fur, white nose3/8 brown fur, gray nose 1/8 brown fur, white noseBased on the phenotypes of the offspring, what are the genotypes of the parents? Make sure you define your genotypes (ie B is brown fur, b is white fur)arrow_forward
- A farmer is interested in a novel colour pattern in beans. This trait is controlled by a single autosomal gene (Gene G) with two alleles. The G-allele results in a striped bean, while the recessive g-allele causes a brown bean. The farmer has a plant that has striped beans. Can you suggest how the farmer can determine the genotype (GG or Gg) of his bean plant in a single cross? Describe this cross and provide details on how you would interpret the resultsarrow_forwardIn rabbits, black hair is due to a dominant allele B and brown hair to its recessive allele b. Short hair (H) is dominant to long hair (h). In a cross between a homozygous black, longhaired rabbit and a brown, homozygous shorthaired one, what would the F1 generation look like? If you did not know the genotype of an F1 rabbit, you could determine its genotype by a test cross in which it is crossed with an animal with which phenotype AND genotype If you carried out this test cross, what phenotypes and in what ratio would you expect? What phenotypes in what ratio would be expected in the F2 generation?arrow_forwardIn rabbits, black fur (F) is dominant to white fur (f). You decide to cross a rabbit that is homozygous dominant for fur color with a rabbit that is heterozygous for fur color. Set up a Punnett Square for this cross and then answer the following questions. What percentage of offspring will have the FF phenotype?What percentage of offspring will have the ff phenotype?What percentage of offspring will have the Ff phenotype?arrow_forward
- Red foxes are a species that has genetic sex determination similar to humans, where females are XX and males are XY. You are studying a wild population of these foxes and you discover a new X-linked allele for tail shape that produces curly tails. This new allele curly (X“) is recessive to the normal allele (X4). If you cross a female with a curly tail with a male with a normal tail, what proportion of the male offspring will have curly tails? O a. O O b. 0.25 О с. 0.5 O d. 0.75 е. 1arrow_forwardIf you did an experimental cross and got 1152 individual offspring, how many of those offspring would have to be yellow to have a 3:1 (Yellow: green) ratio from the cross?arrow_forwardIn guineapigs, an allele for rough fur (R) is dominant over an allele for smooth fur (r); an allele for black coat (B) is dominant over that for white (b). You have an animal with rough, black fur. What cross would you use to determine whether the animal is homozygous for these traits? What phenotype would you expect the offspring if the animal is homozygous?arrow_forward
- In sasquatches, solid coat color (D) is dominant over spotted coats (d) and straight fur (R) is dominant over frizzy fur (r). You have a solid-colored sasquatch with straight fur and want to determine its genotype, so you decide to perform a TEST CROSS. What is the GENOTYPE of the sasquatch you would cross to this solid-colored, straight haired sasquatch? HINT: Go read the section of chapter 3 on testcrosses, pg. 57 of edition 5. spotted coat with frizzy fur solid coat with straight fur ddrr DdRrarrow_forwardIn rabbits, black fur (F) is dominant to white fur (f). You decide to cross a rabbit that is homozygous dominant for fur color with a rabbit that is heterozygous for fur color. Set up a Punnett Square for this cross and then answer the following questions. What percentage of offspring will have the [ Choose ] FF phenotype? What percentage of offspring will have the ff [ Choose ] phenotype? What percentage of offspring will have the Ff [ Choose ] phenotype? > > >arrow_forwardImagine 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_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Human Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage Learning
Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College
Human Biology (MindTap Course List)
Biology
ISBN:9781305112100
Author:Cecie Starr, Beverly McMillan
Publisher:Cengage Learning
Concepts of Biology
Biology
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:OpenStax College
How to solve genetics probability problems; Author: Shomu's Biology;https://www.youtube.com/watch?v=R0yjfb1ooUs;License: Standard YouTube License, CC-BY
Beyond Mendelian Genetics: Complex Patterns of Inheritance; Author: Professor Dave Explains;https://www.youtube.com/watch?v=-EmvmBuK-B8;License: Standard YouTube License, CC-BY