Human Biology: Concepts and Current Issues (8th Edition)
8th Edition
ISBN: 9780134042435
Author: Michael D. Johnson
Publisher: PEARSON
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Textbook Question
Chapter 19, Problem 1AWK
What fraction of the offspring of two wavy-haired Caucasians would have wavy hair? Explain using a Punnett square. Hint: The allele for curly hair exhibits incomplete dominance over the allele for straight hair.
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Incomplete Dominance: 1) On the planet Iota Geminorum IV there exists a small hairy animal known as a tribble. It comes in three colors blue, red, and purple. This trait is controlled by a single locus with incompletre dominance. A homozygous CBCB is blue, a homozygous CRCR is red, and a heterozygous CBCR is purple.
a. What would be the genotypes and phenotypes of the offspring if a blue tribble were crossed with a red one?
b. If the offspring in #1 were crossed what would the genotypic and phenotypic ratios be of this generation?
In addition to the allelic pair determining pattern baldness in man (B,b), consider early baldness to be due to another autosomal allele (E) on a different pair of chromosomes and also dominant in males but recessive in females. The phenotype for ee may be late or nonbaldness depending on sex and the genotype for B, b alleles. Two doubly heterozygous persons marry.
What is the phenotype of the male parent?
What is the phenotype of the female parent?
Give the phenotypic ratio expected among male children of couples such as this one. Show corresponding genotypes for each phenotype mentioned in your phenotypic ratio.
Give the phenotypic ratio expected among female children of couples such as this one. Show corresponding genotypes for each phenotype mentioned in your phenotypic ratio.
Black eye (B) is dominant over brown eye (b). A man that is a homozygous dominant black-eyed marries a woman that is a heterozygous black-eyed. The offspring resulted to 50% homozygous black and 50% heterozygous black. If one of their heterozygous children marries another heterozygous partner. Regardless of its gender, what are the genotypes of their children?
a. 25% BB, 50% Bb, 25% bb
b. 50% BB, 25% Bb, 25% bb
c. 25% BB, 25% Bb, 50% bb
d. 0% BB, 75% Bb, 25% bb
In Law of Codominance, a pure line dominant trait crossed with a recessive trait will result to the appearance of both dominant and recessive trait in the offspring. What is the percentage of having a red-haired offspring if the parental genotype is both a heterozygous roan haired? Red hair is a dominant trait and white hair is a recessive trait.
a. 100%
b. 75%
c. 50%
d. 25%
e. 0%
Chapter 19 Solutions
Human Biology: Concepts and Current Issues (8th Edition)
Ch. 19 - If you might be a carrier of a gene for an...Ch. 19 - Prob. 2QCCh. 19 - Prob. 1CRCh. 19 - Prob. 2CRCh. 19 -
3. Distinguish between genotype and phenotype.
Ch. 19 - Describe the contributions of Mendel to the field...Ch. 19 - Explain how alterations of chromosome number and...Ch. 19 - Prob. 6CRCh. 19 - Prob. 7CRCh. 19 - Describe what is meant by sex-linked inheritance.
Ch. 19 -
9. Explain why lethal diseases caused by dominant...Ch. 19 - Prob. 10CRCh. 19 - All of the following statements about homologous...Ch. 19 - Prob. 2TYCh. 19 -
3. Which of the following statements correctly...Ch. 19 - Prob. 4TYCh. 19 - Prob. 5TYCh. 19 - Prob. 6TYCh. 19 - Prob. 7TYCh. 19 - Which of the following results in the separation...Ch. 19 - Prob. 9TYCh. 19 - Prob. 10TYCh. 19 - What tool is used to determine the probabilities...Ch. 19 - Prob. 12TYCh. 19 - What is the basis for the tremendous genetic...Ch. 19 - Prob. 14TYCh. 19 -
15. Which of the following events or processes...Ch. 19 -
1. What fraction of the offspring of two...Ch. 19 -
2. Why is it that the range of resting blood...Ch. 19 - Prob. 3AWKCh. 19 - Geneticists often study patterns of gene transfer...Ch. 19 - Prob. 5AWKCh. 19 - Prob. 6AWKCh. 19 - Nondisjunction during meiosis can lead to the...
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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
- Phenotypic ratio: red : pink : white Solve the following genetic problems involving incomplete dominance. You must pick the right letter to represent the gene in the question. You must show your work using the Punnett square. 15. A rooster with grey feathers is mated with a hen of the same phenotype. Among their offspring 15 chicks are grey, 6 are black and 8 are white. a. What is the simplest explanation for the inheritance of these colors in chickens? b. What offspring would you expect from the mating of a grey rooster and a black hen?arrow_forwardIn humans, a widow’s peak hairline (H) has complete dominance over the straight hairline (h).What is the genotype for an individual that homozygous dominant for this traitarrow_forwardIn domestic cats, the allele (L) is a dominant allele for short-hair trait. The recessive allele for long hair is (I). A female cat with a LI genotype has kittens with a male cat with a II genotype. What is the probability that a kitten has short hair? Hint: it may be helpful to draw a Punnett Square.arrow_forward
- In rabbits, white coat color (CW) and black coat color (CB) are codominant, and both of these alleles are dominant over albino (c); heterozygotes (CWCB) are spotted. Predict the genotypes and phenotypes of the offspring from a heterozygous black-coated rabbit and a homozygous white-coated rabbit.arrow_forwardThe dominance pattern of a gene can be determined from the phenotypes of the parents and offspring. In the examples below, assume that each parent is homozygous for the specific allele and that the progeny are heterozygous. Classify each example as either complete dominance, incomplete dominance, or codominance. Complete dominance Incomplete dominance Codominance Answer Bank A black sheep and a white sheep produce a gray lamb. A white cow and a red bull have a calf that is white with red spots (roan colored). A mother with type A blood and a father with type B blood have a daughter with type AB blood. A pea plant with all purple flowers and a pea plant with all white flowers produce a pea plant with all purple flowers. A moth with red wings and a moth with yellow wings produce a moth with orange wings.arrow_forwardIn domestic cats, the dominant allele A encodes pigmented fur and the recessive allele a encodes white fur. Two cats with Aa genotypes have a litter of kittens. For each kitten, what is the probability that the kitten has pigmented fur? Hint: it may be helpful to draw a Punnett square.arrow_forward
- In the guinea pig, one locus involved in the control of coat color may be occupied by any of 4 alleles: C (full color), ck (sepia), cd (cream), or ca (albino). The order of dominance is C > ck > cd > ca. A sepia pig was crossed with a cream pig, where the sepia pig had 2 full-color parents & the cream pig had 2 sepia parents. One of the piglets from this cross was albino. What phenotypic ratio is expected from this cross? A) All sepia piglets B) 1/2 full color : 1/4 sepia : 1/4 cream piglets C) 1/2 cream : 1/2 albino piglets D) 1/2 sepia : 1/4 cream : 1/4 albino piglets E) 3/4 sepia & 1/4 cream piglets F) All cream piglets G) 1/2 sepia : 1/2 cream pigletsarrow_forwardIn guinea pigs, the allele for short hair is dominant. If all the guinea pigs are born short haired what are the possible genotypes of the parents? (There are two possible combinations.) Show the answers with punnett squarearrow_forwardImagine you have a blood group of "X" which is recessive and expressed by xx. The dominant blood groups are Y and Z, where homozygous of these alleles are expressed as YY and ZZ, respectively. What will be the genotype of your parents blood group? Why? Please explain in your own words. [Max 200 words]arrow_forward
- Provide an example of incomplete dominance. Does the genotypic ratio equal the phenotypic ratio?arrow_forwardIn horses, height is controlled by incomplete dominance. The two alleles are Tall (T) and short (T’). The heterozygous genotype is expressed as medium height. What is the phenotype of a horse with the genotype TT? What is the phenotype of a horse with the genotype T’T’? What is the phenotype of a horse with the genotype TT’? *arrow_forwardIn humans, the genes for red-green color blindness (R=normal, r=color-blind) and hemophilia A (H=normal, h=hemophilia) are both X-linked and only 3 map units apart. Suppose a woman has four sons, and two are colorblind and have hemophilia and two are normal. What is the probable genotype of the woman? Group of answer choices HR/hr Hr/hr hr/hr Hr/hRarrow_forward
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