Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
Publisher: PEARSON
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Chapter 12.2, Problem 3CC
MAKE CONNECTIONS Consider what you learned about dominant and recessive alleles in Concept 11.1. If a disorder were caused by a dominant X-linked allele, how would the inheritance pattern differ from what we see for recessive X-linked disorders?
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EXAMPLE PROBLEM Two black female mice are crossed with a brown male. In several litters, female I produced 9 black offspring and 7 brown; female II produced 57 black offspring. What deductions can you make about the inheritance of black and brown coat color in mice? What are the genotypes of the parents? Dominance and recessive describe which of two possible phenotypes are exhibited when two different alleles occur in the same individual.
??
. Consider the imaginary trait, bristles with split-ends, a trait hypothesized to be X-linked dominant. In a cross,
the P1 virgin females were homozygous wild type while the males had bristles with split-ends. The F1 84 males
were all wild type while the 90 females all had split-ends. In addition, the data for the F2 generation revealed 26
wild type males, 35 wild type females, 29 split-end males and 40 split-end females. Is this what is to be expected?
Use chi-square to prove your position.
Chapter 12 Solutions
Campbell Biology in Focus
Ch. 12.1 - Which one of Mendels laws relates to the...Ch. 12.1 - MAKE CONNECTIONS Review the description of meiosis...Ch. 12.1 - WHAT IF? Propose a possible reason that the first...Ch. 12.2 - A white-eyed female Drosophila is mated with a...Ch. 12.2 - Neither Tim nor Rhoda has Duchenne muscular...Ch. 12.2 - MAKE CONNECTIONS Consider what you learned about...Ch. 12.3 - When two genes are located on the same chromosome,...Ch. 12.3 - For each type of offspring of the testcross in...Ch. 12.3 - WHAT IF? Genes A, B, and C are located on the same...Ch. 12.4 - About 5% of individuals with Down syndrome have a...
Ch. 12.4 - WHAT IF? The ABO blood type locus has been mapped...Ch. 12.4 - MAKE CONNECTIONS The gene that is activated on the...Ch. 12.4 - Women born with an extra X chromosome (XXX) are...Ch. 12 - A man with hemophilia (a recessive, sex-linked...Ch. 12 - Pseudohypertrophic muscular dystrophy is an...Ch. 12 - A space probe discovers a planet inhabited by...Ch. 12 - Using the information from problem 3, scientists...Ch. 12 - A man with red-green color blindness (a recessive,...Ch. 12 - You design Drosophila crosses to provide...Ch. 12 - A wild-type fruit fly (heterozygous for gray body...Ch. 12 - Assume that genes A and B are 50 map units apart...Ch. 12 - Prob. 9TYUCh. 12 - SCIENTIFIC INQUIRY DRAW IT Assume you are mapping...Ch. 12 - FOCUS ON EVOLUTION Crossing over is thought to be...Ch. 12 - FOCUS ON INFORMATION The continuity of life is...Ch. 12 - SYNTHESIZE YOUR KNOWLEDGE Butterflies have an X-Y...
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- Red-green colorblindness caused by an X-linked recessive allele in humans. • A woman who had a colorblind father and a man with typical vision have a child together. Indicate the probability that their child will have red-green colorblindness for both a girl and a boy. • A woman with no family history of colorblindness and a man with red-green colorblindness have a child together. Indicate the probability that their child will have red-green colorblindness for both a girl and a boy.arrow_forwardCould the trait presented in the pedigree shown be caused by an X-linked recessive allele? Why or why not? 11 ||| IV ■ 5 6 Yes, with individual 2 of generation I being heterozygous. No, the offspring of 7 and 8 contradict an X-linked recessive inheritance. No, the offspring of 3 and 4 of generation II contradict an X-linked recessive inheritance. No, the offspring of 1 and 2 of generation I contradict an X-linked recessive inheritance.arrow_forwardWhat is a Barr body? How many Barr bodies in a person with genotype XXXXX? How is the structure of a Barr body different from that of other chromosomes in the cell? How does the structure of a Barr body affect gene expression? Color-blindness is an X-linked recessive trait. Heterozygous females are not color blind but they can sometimes have partial color blindness. Explain how this can occur.arrow_forward
- Choose one plsarrow_forwardPlease help asaparrow_forwardPlease explain question 5 5. In some cats, black color is due to a sex-linked (x-linked) recessive allele (Xb); the dominant allele (XB) produces orange color. The heterozygote (XBXb) is calico. What kinds (genotypes) of parents would be responsible for producing only calico females and black males?arrow_forward
- Step by steparrow_forwardNLFN3, a gene in the X chromosome has been linked to Autism spectrum disorder ASD. Research has shown that the mutation R451C (represented by the allele X+) is recessive and causes ASD. Ear lobes in humans are coded by a single gene which displays simple dominance. E results in free earlobes, and e corresponds to attached earlobes. What is the probability of having a female offspring with ASD symptoms and attached earlobes from X+Y Ee and X+X ee parents? 25% O 100% 0% O 75% O 12.5% O 50%arrow_forwardIn humans, Cystic Fibrosis an autosomal recessive trait, currently with medicine advances people affected by this disease can live until the 40s and 50s even. A couple in which the mother is a known carrier for this disease plans to have 4 children with a man who is not affected either but had his father who had the disease. A) Please state the genotypes of the parents. Use C to denote the dominant allele and c as the recessive B) Determine the probability that the first 2 children born have Cystic Fibrosis and the 2 last children are not affected. C) In general, what proportion of the children are expected to be female carriers of Cystic Fibrosis trait?arrow_forward
- Choose one plsarrow_forwardRed-green color blindness is inherited as an X-linked recessive (Xc). If a color-blind man marries a woman who is heterozygous for normal vision, what would be the expected phenotypes of their children with reference to this character? In your answer, specify in your phenotype descriptions the gender of the children. (For example, don’t just say 75% of the children would be colorblind – you would instead say 100 % of the daughters would be colorblind and 50% of the sons would be colorblind. Note that this is not a correct answer; it is just to give you an idea of how to explain the correct phenotypes of the cross.)___arrow_forwardDUCHENNE MUSCULAR DYSTROPHY IS AN X-LINKED RECESSIVE TRAIT THAT CAUSES PROGRESSIVE MUSCLE WASTING. BEFORE 1970, OVER 85% OF AFFECTED INDIVIDUALS DIED BEFORE THE AGE OF 25. IN THE SPACE BELOW, ANSWER THESE TWO QUESTIONS: • WHY IS IT VERY RARE (8%, LESS THAN EXPECTED FOR AN X-LINKED RECESSIVE TRAIT) TO FIND FEMALES AFFECTED BY THIS DISORDER? • A WOMAN WHOSE BROTHER HAS THIS DISEASE WISHES TO HAVE CHILDREN. ASSUME EVERYONE ELSE IN THIS FAMILY IS UNAFFECTED. WHAT IS THE PROBABILITY THAT SHE WILL PASS THIS TRAIT ON TO A SON? (HINT: WHAT IS THE PROBABILITY SHE IS A CARRIER AND PASSES HER AFFECTED ALLELE?)arrow_forward
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