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Ch. 9 Patterns of Inheritance
Taylor - Campbell Biology: Concepts & Connections 10th Edition
Taylor, Simon, Dickey, Hogan10th EditionCampbell Biology: Concepts & ConnectionsISBN: 9780136538783Not the one you use?Change textbook
All textbooksTaylor, Simon, Dickey, Hogan 10th EditionCh. 9 Patterns of InheritanceProblem 5
Chapter 9, Problem 5

A man with type B blood and a woman who has type A blood could have children of which of the following phenotypes?
a. A or B only
b. AB only
c. AB or O
d. A, B, AB, or O

Verified step by step guidance
1
Step 1: Understand the inheritance of blood types. Blood type is determined by the ABO blood group system, which involves three alleles: I^A (type A), I^B (type B), and i (type O). I^A and I^B are codominant, meaning both can be expressed if inherited together, while i is recessive.
Step 2: Determine the possible genotypes of the parents. A man with type B blood could have the genotype I^B I^B or I^B i, and a woman with type A blood could have the genotype I^A I^A or I^A i.
Step 3: Use a Punnett square to calculate the possible combinations of alleles the children could inherit. Pair each allele from the father with each allele from the mother to determine the offspring's genotypes.
Step 4: Translate the genotypes into phenotypes. For example, I^A I^B results in type AB blood, I^A i results in type A blood, I^B i results in type B blood, and ii results in type O blood.
Step 5: Analyze the results from the Punnett square to determine all possible phenotypes of the children. Based on the combinations, the children could have blood types A, B, AB, or O.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Blood Type Inheritance

Blood type is determined by the ABO gene, which has three alleles: A, B, and O. Each person inherits one allele from each parent, leading to four possible blood types: A (AA or AO), B (BB or BO), AB (AB), and O (OO). Understanding how these alleles combine is crucial for predicting the blood types of offspring.
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Autosomal Inheritance

Genotype and Phenotype

Genotype refers to the genetic makeup of an individual, while phenotype is the observable expression of that genotype. For blood types, the genotype determines the phenotype, meaning that the combination of alleles inherited from the parents will dictate the blood type of their children.
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Genotype & Phenotype

Punnett Square

A Punnett square is a tool used in genetics to predict the possible genotypes of offspring from two parents. By mapping the alleles of each parent, one can visualize the potential combinations and determine the likelihood of each blood type appearing in their children, aiding in answering questions about inheritance patterns.
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Punnett Squares
Related Practice
Textbook Question

Whether an allele is dominant or recessive depends on

a. How common the allele is, relative to other alleles

b. Whether it is inherited from the mother or the father

c. Whether it or another allele determines the phenotype when both are present

d. Whether or not it is linked to other genes

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Textbook Question

Edward was found to be heterozygous (Ss) for sickle-cell trait. The alleles represented by the letters S and s are

a. Linked

b. On homologous chromosomes

c. Both present in each of Edward's sperm cells

d. On the same chromosome but far apart

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Textbook Question

Two fruit flies with eyes of the usual red color are crossed, and their offspring are as follows: 77 red-eyed males, 71 ruby-eyed males, 152 red-eyed females. The allele for ruby eyes is

a. Autosomal (carried on an autosome) and dominant

b. Autosomal and recessive

c. Sex-linked and dominant

d. Sex-linked and recessive

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Textbook Question
Tim and Jan both have freckles but their son Mike does not. Show with a Punnett square how this is possible. If Tim and Jan have two more children, what is the probability that both will have freckles?
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Textbook Question

Both Tim and Jan have a widow's peak (see Module 9.8), but Mike has a straight hairline.

What are their genotypes?

What is the probability that Tim and Jan's next child will have freckles and a straight hairline?

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Textbook Question
In rabbits, black hair depends on a dominant allele, B, and brown hair on a recessive allele, b. Short hair is due to a dominant allele, S, and long hair to a recessive allele, s. If a true-breeding black short-haired male is mated with a brown long-haired female, describe their offspring. What will be the genotypes of the offspring? If two of these F1 rabbits are mated, what phenotypes would you expect among their offspring? In what proportions?
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