Multiple Choice
A gene for the MN blood group has codominant alleles M and N. If both children in a family are of blood type M, which of the following situations is possible?
29. Heredity
Patterns of Inheritance
Back29. Heredity
Patterns of Inheritance
- Textbook Question
Hemophilia A, a condition in which blood does not clot properly, is a recessive trait located on the X chromosome (Xʰ). Suppose that a woman who is heterozygous for this trait (XXʰ) has children with a normal male (XY). What is the probability that the couple will have daughters with hemophilia? What is the probability that the couple will have sons with hemophilia?
- Multiple ChoiceThe larger the number of offspring, the greater the likelihood that the observed ratios will conform to the values predicted by the Punnett square.1views
- Multiple ChoiceIf a male inherits a sex-linked gene for color blindness, __________.1views
- Textbook Question
Indicate the type of inheritance involved in each of the following situations.
(b) Children exhibit the trait even though neither parent does.
- Textbook Question
Recessive X-linked traits
(a) Are passed from fathers to their sons
(b) Are more likely to be expressed in males
(c) Always affect some aspect of the reproductive system
(d) Are never expressed in females
(e) Cannot be passed from mothers to daughters
- Open Question
In skin color inheritance, what will be the relative range of pigmentation in offspring arising from the following parental matches?
(a) AABBCC × aabbcc
(b) AABBCC × AaBbCc
(c) Aabbcc × aabbcc
1views - Multiple ChoiceCodominant alleles are present in __________.3views
- Multiple ChoiceA person who inherits the A and the O blood type alleles will possess which blood type?
- Textbook Question
Distinguish between the following paired terms:
(c) simple inheritance and polygenic inheritance.
- Textbook Question
Certain diseases are transmitted via mitochondrial DNA. Which cell types do you think would be most affected by such diseases, and why?
3views - Multiple ChoiceMarfan syndrome is inherited in an autosomal dominant pattern. Which of the following is true?
- Textbook Question
Indicate the type of inheritance involved in each of the following situations.
(d) The trait is expressed equally in daughters and sons.
- Textbook Question
Indicate the type of inheritance involved in each of the following situations.
(c) The trait is expressed more commonly in sons than in daughters.
- Open Question
Suppose that the ability to taste PTC (phenylthiocarbamide) depends on the presence of a dominant gene T; nontasters are homozygous for the recessive gene t. This would be a case of classical dominant-recessive inheritance.
(a) Consider a mating between heterozygous parents producing three offspring. What proportion of the offspring are likely to be tasters? What is the chance that all three offspring will be tasters? Nontasters? What is the chance that two will be tasters and one will be a nontaster?
(b) Consider a mating between Tt and tt parents. What is the anticipated percentage of tasters? Nontasters? What proportion can be expected to be homozygous recessive? Heterozygous? Homozygous dominant?
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