Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 12, Problem 16RQ
A farmer raises black and white chickens. To his surprise, when the first generation of eggs hatch all the chickens are black with white speckles throughout their feathers. What should the farmer expect when the eggs laid after interbreeding the speckled chickens hatch?
- All the offspring will be speckled
- 75% of the offspring will be speckled, and 25% will be black
- 50% of the offspring will be speckled, 25% will be black, and 25% will be white
- 50% of the offspring will be black and 50% of the offspring will be white.
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Students have asked these similar questions
You breed two black dogs. It results in 3 offspring, the first which is black, the second which is brown, and the third which is white.
Give two genetic explanations as to what could cause their fur color. Make sure each explanation includes two genes and follows along with the provided data. Also, explain the genotype of each color of dog and a ratio of the F2 phenotypes you would expect to see from a dihybrid cross.
After you're finished, pick one of the explanations and create a hypothesis for the function of each gene which would explain the molecular basis of the fur color
Finally, for each of the two genes, explain how a specific functional difference between the two alleles leads to a difference in their functions
A class of students mated fruit flies to study the inheritance of traits. The crosses and their results are described below.
Cross 1: A female fruit fly with red eyes mates with a male fruit fly with brown eyes producing 63 offspring. All 63 offspring in this first generation have red eyes.
Cross 3: A female fruit fly with black and tan striped body color mates with a male with black body color. In this first generation, al 56 offspring have black and tan striped body color.
Cross 2: A red-eyed male and a red- eyed female from the first-generation mate to produce a second generation of flies. Out of the 98 offspring produced, 74 have red eyes and 24 have brown eyes.
Cross 4: A black and tan striped male and a black and tan striped female from the first-generation mate to produce a second generation of flies. Out of the 103 offspring, 76 have black and tan striped body color and 27 have black body color.
How do meiosis and gene expression…
Heterozygous Cc chickens express a condition called creeper, in
which the leg and wing bones are shorter than normal (cc). The
dominant C allele is lethal when homozygous. Skin color is
determined by the alleles W and w.
W_ chickens have white skin and ww chickens have yellow skin.
In a mating between 2 chickens heterozygous for both of these
genes:
1) What phenotypes will be observed in the progeny?
2) What fraction of the offspring will have each phenotype?
Assign alleles.
List possible phentoypes.
Make gametes, draw Punnett square, and list fractions of
genotypes and/or phenotypes of offspring,
Chapter 12 Solutions
Biology 2e
Ch. 12 - Figure 12.5 In pea plants, round peas (R) are...Ch. 12 - Figure 12.6 What are the genotypes of the...Ch. 12 - Figure 12.12 What ratio of offspring would result...Ch. 12 - Figure 12.16 In pea plants, purple flowers (P) are...Ch. 12 - Mendel performed hybridizations by transferring...Ch. 12 - Which is one of the seven characteristics that...Ch. 12 - Imagine you are performing a cross involving seed...Ch. 12 - Consider a cross to investigate the pea pod...Ch. 12 - A scientist pollinates a true-breeding pea plant...Ch. 12 - The observable traits expressed by an organism are...
Ch. 12 - A recessive trait will be observed in individuals...Ch. 12 - If black and white true-breeding mice are mated...Ch. 12 - The ABO blood groups in humans are expressed as...Ch. 12 - In a mating between two individuals that are...Ch. 12 - If the allele encoding polydactyly (six fingers)...Ch. 12 - A farmer raises black and white chickens. To his...Ch. 12 - Assuming no gene linkage, in a dihybrid cross of...Ch. 12 - The forked line and probability methods make use...Ch. 12 - How many different offspring genotypes are...Ch. 12 - Labrador retriever's fur color is controlled by...Ch. 12 - Which of the following situations does not follow...Ch. 12 - Describe one of the reasons why the garden pea was...Ch. 12 - How would you perform a reciprocal cross for the...Ch. 12 - Mendel performs a cross using a true-breeding pea...Ch. 12 - Calculate the probability of selecting a heart or...Ch. 12 - The gene for flower position in pea plants exists...Ch. 12 - Use a Punnett square to predict the offspring in a...Ch. 12 - Can a human male be a carrier of red-green color...Ch. 12 - Why is it more efficient to perform a test cross...Ch. 12 - Use the probability method to calculate the...Ch. 12 - Explain epistatis in terms of its Greek-language...Ch. 12 - In Section 12.3, ''Laws of Inheritance," an...Ch. 12 - People with trisomy 21 develop Down’s syndrome....Ch. 12 - A heterozygous pea plant produces violet flowers...
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