Concepts of Biology
1st Edition
ISBN: 9781938168116
Author: Samantha Fowler, Rebecca Roush, James Wise
Publisher: OpenStax College
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Textbook Question
Chapter 8, Problem 11RQ
The ABO blood groups in humans are expressed as the
a. multiple alleles and incomplete dominance
b. codominance and incomplete dominance
c. incomplete dominance only
d. multiple alleles and codominance
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The ABO blood groups in humans are expressed as the IA, IB, and i alleles. The IA allele encodes the A blood group antigen, IB encodes B, and i encodes O. Both A and B are dominant to O. If a heterozygous blood type A parent (IAi) and a heterozygous blood type B parent (IBi) mate, one quarter of their offspring will have AB blood type (IAIB) in which both antigens are expressed equally. Therefore, ABO blood groups are an example of: a. multiple alleles and incomplete dominance b. codominance and incomplete dominance c. incomplete dominance only d. multiple alleles and codominance
Consider two blood polymorphisms that humans have in addition to the ABO system. Two alleles LM and LN determine the M, N, and MN blood groups. The dominant allele R of a different gene causes a person to have the Rh+ (rhesus positive) phenotype, whereas the homozygote for r is Rh− (rhesus negative). Two men took a paternity dispute to court, each claiming three children to be his own. The blood groups of the men, the children, and their mother were as follows:From this evidence, can the paternity of the children be established?
In 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?
Chapter 8 Solutions
Concepts of Biology
Ch. 8 - Figure 8.9 In pea plants, round peas (R) are...Ch. 8 - Figure 8.10 In pea plants, purple flowers (P) are...Ch. 8 - Figure 8.16 What ratio of offspring would result...Ch. 8 - Imagine that you are performing a cross involving...Ch. 8 - Imagine that you are performing a cross involving...Ch. 8 - The observable traits expressed by an organism are...Ch. 8 - A recessive trait will be observed in individuals...Ch. 8 - What are the types of gametes that can be produced...Ch. 8 - What is the reason for doing a test cross? a. to...Ch. 8 - If black and white true-breeding mice are mated...
Ch. 8 - The ABO blood groups in humans are expressed as...Ch. 8 - In a cross between a homozygous red-eyed female...Ch. 8 - When a population has a gene with four alleles...Ch. 8 - Describe one of the reasons that made the garden...Ch. 8 - Use a Punnett square to predict the offspring in a...Ch. 8 - Use a Punnett square to predict the offspring in a...Ch. 8 - Can a male be a carrier of red-green color...Ch. 8 - Could an individual with blood type O (genotype...
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- The A & B antigens in humans may be found in water-soluble forms in secretions, including saliva of individuals with the genotypes E/E& E/e, but not individuals with the genotype e/e. Thus, the population contains ‘secretors’ & ‘nonsecretors’. A cross was performed between 2 heterozygous secretors, one with type O blood and the second with type AB blood. What phenotypic ratios are expected in their offspring? A) 1/4 type A : 1/4 type B : 1/2 non-secretor B) 3/8 type A : 3/8 type B : 2/8 non-secretor C) 1/2 type A : 1/2 type B D) 3/4 type AB : 1/4 non-secretorarrow_forwardCould an individual with blood type O (genotype ii) be a legitimate child of parents in which one parent had blood type A and the other parent had blood type B?arrow_forwardThe ABO blood system has been used to settle cases of disputed paternity. Suppose, as a geneticist, you must testify during a case in which the mother has type A blood, the child has type O blood, and the alleged father has type B blood. How would you respond to the following statements? a. Mans attorney: The mother has type A blood, so the childs type O blood must have come from the father. Because my client has type B blood, he could not be the father. b. Mothers attorney: Further tests prove this man is heterozygous, so he must be the father.arrow_forward
- A woman with Type AB blood marries a man heterozygous for Type B blood. Their children could have each of these blood types EXCEPT - Type O Type B. Туре AB. Туре А.arrow_forwardIn human blood chemistry, the I gene directly determines ABO blood antigens and the H gene takes the H-substance precursor and makes the H-substance. IAIO Hh x IBIO Hh. Given the following cross, help me with the question please 17. What type of allele interaction is this, the influence of alleles at gene H versus those at gene I?A) dominance B) recessive C) incomplete dominance D) epistasis 18. What is the likelihood of a child with a type O serotype based on a blood test?A) 0.0 < p < 0.1 D) 0.3 < p < 0.4 G) 0.6 < p < 0.7 J) 0.9 < p < 1.0B) 0.1 < p < 0.2 E) 0.4 < p < 0.5 H) 0.7 < p < 0.8C) 0.2 < p < 0.3 F) 0.5 < p < 0.6 I) 0.8 < p < 0.9arrow_forwardBronze coloured turkey is controlled by a dominant allele, B. Red coloured turkey is homozygous for a recessive allele bb. Dominant gene N produce normal feather and recessive genotype produce ‘hairy’ feather nn. In a cross between homozygous bronzed coloured turkey with ‘hairy’ feather and homozygous red coloured turkey with normal feather. What are the ratios of F2 progeny with Bbnn genotypes? (I want to check if what i'm doing is correct)arrow_forward
- The dominance pattern oI a gene can de determinea irom ine pnenotypes oI tne parents ana olispring. in ine exampies 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 moth with red wings and a moth with yellow wings produce a moth with orange wings.arrow_forwardDo number 27, 28, 29 and 30arrow_forwardA is dominant over a and B is dominant over b. Genes A/a and B/b assort independently. The parental cross (P) is between true- breeding (homozygous) strains (AA bb x aa BB). The resulting F1 offspring would be [Select ] A F1 x F1 cross gives the F2 generation. The ratio of phenotypes in the F2 generation can be described as [ Select ] In the phenotypic ratio, what number refers to individuals that are: dominant for both traits? [ Select ] recessive for both traits? [Select ] To what phenotypes do the "3"s in the ratio refer? [ Select ] > >arrow_forward
- Imagine 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_forwardThe allele for red flowers (R) and blue flowers (B) show incomplete dominance producing the heterozygote phenotype of purple flowers. Complete Punnett square and answer the questions for the cross between two purple flowers (RB x RB). R В What is the probability of having red flowers? R What is the probability of having purple flowers? B What is the probability of having blue flowers? :: RR : RB : BB :: 0% :: 25% :: 50% :: 75% :: 100%arrow_forwardIn 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. A) Can a person of blood group 0 give blood from a person AB? Clearly explain your answer (presence or absence of antigens, or antibodies).arrow_forward
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