Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 12, Problem 20RQ
Labrador retriever's fur color is controlled by two alleles, E and B. Any dog with the ee genotype develops into a yellow lab, while B_E_ dogs become black labs and bbE_ dogs become chocolate labs. This is an example of.____
- epistasis
- codominance
- incomplete dominance
- linkage
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In humans the ABO blood system is controlled by multiple alleles. Allele Ia produces antigen A, alleles Ib produces antigen B, and allele i produces no antigen. The hierarchy of dominance is Ia = Ib> i.
QUESTION
Two children are born in a hospital, both in group 0. The nurses confuse the children and now they do not know who the parents are. They call you to solve this situation: With the following information, tell which partner is each child. Explain your answer considering the phenotype and genotype of the parents.
Couple 1 - Mr. A heterozygous and Mrs. AB Couple 2 - Mr. A heterozygous and Mrs. B heterozygous.
The presence of second allele (E) affects the coat color of Labrador. In particular, the presence of homozygous recessive ee produces yellow Labrador. Supposed a male Lab, homozygous dominant for both alleles, is crossed with a female Lab, homozygous recessive for both alleles, what would be the phenotypic ratio of the F1 offspring?
The fur color gene in rabbits has a dominant allele B with a black
phenotype and a recessive allele with a brown phenotype. The rabbit
hair length gene has a dominant allele S for short hair, and a long hair
recessive allele s. In a cross between a homozygous black-long-hair
rabbit with a homozygous brown-short rabbit, what would be the
genotype(s) B_s_
v and phenotype(s)
[ Select ]
of the F1 generation? What would be the
genotype(s) [ Select ]
and phenotype(s)
[ Select ]
of the F2 generation?
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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- In radishes, the gene controlling color exhibits incomplete dominance. Pure breeding red radishes (genotype RR) crossed with pure breeding white radishes make purple radishes. If a purple radish is crossed with a white radish, the genotypes of the progeny will be -- %Rr The phenotypes will be --% purple radishearrow_forwardThe presence of second allele (E) affects the coat color of Labrador. In particular, the presence of homozygous recessive ee produces yellow Labrador. Supposed a male Lab, homozygous dominant for both alleles, is crossed with a female Lab, homozygous recessive for both alleles, show a punnett square for this crossarrow_forwardIn cats, Manx (M) is a dominant allele that results in cats lacking a tail. The recessive allele (m) gives a cat with a tail. (A) Write out the genotype of a heterozygous cat (B) What is the phenotype of the cat in (A)? (C) The cat in (A) has offspring with a cat that has a tail. What fraction of the offspring of that cat will have tails? In peas, round (R) is dominant to wrinkled. (r )You cross a round pea plant to a wrinkled pea plant and half the offspring are round and half the offspring are wrinkled. What are the genotypes of the parents?arrow_forward
- Imagine a cross between a man and a woman having the following genotypes: Genotype of the Husband Genotype of the Wife Aa bb Dd Gg Hh RR Tt X Aa Bb Dd gg Hh Rr Tt Suppose, that the A allele exhibited incomplete dominance over the a allele and the T allele exhibited incomplete dominance over the t allele. In that instance, how many different phenotypes would be possible among the offspring of this same couple?arrow_forwardThe shape of a heliodor is an X-linked trait. Male heliodors inherit two X chromosomes, while the females inherit an X and a Y chromosome. The recessive allele codes for the common bell-shape while the dominant phenotype is a round shape . Hudson is a round male and has offspring with Heidi, a bell-shaped female. They already have one daughter, Hannah, who is shaped like her mother. What percentage of their offspring will be carriers for the bell-shape trait? a.0% b.25% c.50% d.75% e.100%arrow_forwardIf a pure- breeding wired hair terrier (WW) is crossed with a pure breeding smooth hair terrier (we) and puppy with wavy hair produced, the simplest explanation is _____ 1 - mutation has occurred 2- hair texture is an X linked trait 3- codominance 4- hair texture is lethal trait 5- incomplete dominancearrow_forward
- The gene for flower color in snapdragons displays incomplete dominance. Snapdragons homozygous for the allele for red flower color have the genotype FRFR and have red flowers. Snapdragons homozygous for the allele for white flower color have the genotype FWFW and have white flowers. Heterozygous snapdragons, with the genotype FRFW, have pink flowers. A snapdragon that has pink flowers is crossed with a different snapdragon that has pink flowers. What percentage of the offspring is expected to have red, white, and pink flowers?arrow_forwardHeterozygous 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,arrow_forwardABO blood group is co-dominant for AB and O is recessive. Rh (+/-) factor is completely dominant. A man with O/positive blood and a woman with A/negative blood have six children. All of their children have A + blood type. What can you conclude about the parents’ genotypes? Group of answer choices Both mother and father are likely homozygous at both loci Mother was homozygous at the ABO locus but heterozygous at the Rh factor locus Father was homozygous at the ABO locus but heterozygous at the Rh factor locus Mother was heterozygous at both lociarrow_forward
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