Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 12, Problem 2VCQ
Figure 12.6 What are the genotypes of the individuals labeled 1, 2, and 3?
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Given the karyotype shown at right, is this a male or a female? Normal or abnormal? What would the phenotype of this individual be?
Cystic fibrosis is an autosomal recessive disorder that affects 1 in 3 000 newborns with Caucasian background. It causes thick mucus build up in various organs and can cause damages and problems in respiratory and digestive systems.
a) What is the frequency of the cystic fibrosis allele in the Caucasian population? Show all your work and express your answer as a value between 0 and 1 rounded to two decimal places.
b) What percentage of the Caucasian population would be carriers for cystic fibrosis? Show all your work and express your answer rounded to two decimal places.
c)If two individuals are carriers of the cystic fibrosis allele, what is the probability that they would have a girl without cystic fibrosis? Show all your work (including the Punnett square) and express your answer as a value between 0 and 1 rounded to two decimal places.
In this pedigree chart, what is the genotype of individual III-1? (It's circled in blue.)
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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- Given the karyotype shown at right, is this a male or a female? Normal or abnormal? What would the phenotype of this individual be?arrow_forwardWhat are the phenotypes? What is the ratio of those phenotypes? The phenotypes would be: (a) Yellow with smooth (b) Yellow with wrinkled 3:1 Part 2: Data Tables Table 1: Parent Genotypes: Monohybrid Crosses Generation Genotype of Individual #1 Genotype of Individual #2 P Yy Ss P1 Yy Ss P2 Yy ss P3 Yy SS P4 YY SS Table 2: Generation Data Produced by Monohybrid Crosses Generation Possible Offspring Genotypes Possible Offspring Phenotypes Genotype Ratio Phenotype Ratio P yySs P1 yySs P2 Yyss P3 YySS P4 YYSS Part 2: Post-Lab Questions How much genotypic variation do you find in the randomly picked parents of your crosses? How much in the offspring? Pool all of the offspring from your five replicates. How much phenotypic variation do you find? Is the ratio of observed…arrow_forwardTable 7.4 Male Gametes (i^iDd) Write in the Gametes and Complete the Punnett Square Female Gametes (i^i^DD) What is the phenotype of the male parent? What is the phenotype of the female parent? What is the genotypic ratio of the offspring? What is the phenotypic ratio of the offspring?arrow_forward
- What is the genotype of individual B-5? What is the probability that individual C-1 is Ww? What is the likelihood that the progeny of D-3 and D-4 will have wooly hair?arrow_forwardWhat cross will result in a ratio of 3 dominant phenotype offspring for every 1 recessive offspring? What cross will result in a 1:2:1 genotype ratio in the offspring? What cross will result in all homozygous recessive offspring?arrow_forwardFigure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are dominant to green (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares would you need to complete a Punnett square analysis of this cross?arrow_forward
- Individuals of genotype AaBb were mated to individuals of genotype aabb. One thousand offspring were counted, with the following results: 474 Aabb, 480 aaBb, 20 AaBb, and 26 aabb. What type of cross is it? Are these loci linked? What are the two parental classes and the two recombinant classes of offspring? What is the percentage of recombination between these two loci? How many map units apart are they?arrow_forwardThree pregnant women due to give birth were admitted to a hospital, accompanied by their partners on the same night. Given that the hospital staff forgot to put name tag on the babies, to be able to identify which baby goes with which couple, a blood test was performed with the following results:arrow_forwardThe blood serum from one individual (let’s call this person individual 1) is known to agglutinate the red blood cells from a secondindividual (individual 2). List the pairwise combinations of possible genotypes that individuals 1 and 2 could have. If individual 1is the parent of individual 2, what are his or her possiblegenotypes?arrow_forward
- 11:34 Make the following Punnett square. RrYYTT x rrYytt 8*8 or 64 squares. Use a blank sheet as needed. What is the phenotypic ratio of the offspring? Your gametes: 1-3-5; 1-3-6; 1-4-5; 1-4-6; 2-3-5; 2-3-6; 2-4-5; 2-4-6;arrow_forwardHow many females are wild type? X Y X Y toarrow_forwardIn pedigrees, individuals are usually specified by using a Roman numeral for their generation in the chart and an Arabic number for their position (reading left to right) within that generation. If we use the letter c for the allele that causes cystic fibrosis, what are the genotypes of individuals III-3 and III-4 (the third and fourth individuals shown in generation III) in the pedigree that shows this disease?arrow_forward
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