Home > 15: The Chromosomal Basis of Inheritance > Pre-Test
 
 
Chapter 15: The Chromosomal Basis of Inheritance
 
Pre-Test
 

Pre-Test


1 .       The most common phenotype in a natural population is referred to as the _____. (Concept 15.1E-Book) [Hint]

 genotype
 wild type
 autosome
 mutant phenotype
 locus
2 .       A white-eyed female Drosophila is crossed with a red-eyed male Drosophila. Which statement below correctly describes the results? (Concept 15.1E-Book) [Hint]

 None of the females will have red eyes.
 None of the females will have white eyes.
 Fifty percent of the females will have red eyes.
 Twenty-five percent of the females will have white eyes.
 Twenty-five percent of the females will have red eyes.


3 .       In general, the frequency with which crossing over occurs between two linked genes depends on _____. (Concept 15.2E-Book) [Hint]

 how far apart they are on the chromosome
 the phase of meiosis in which the crossing over occurs
 whether the genes are on the X or some other chromosome
 whether the genes are dominant or recessive
 the characters the genes code for
4 .       How many map units is a recombination frequency of 5% equal to? (Concept 15.2E-Book) [Hint]

 2.5 centimorgans
 10 centimorgans
 5 centisturtevants
 5%
 5 centimorgans
5 .       In humans, the _____ determines the sex of the offspring because _____. (Concept 15.3E-Book) [Hint]

 male gamete ... each male gamete can contribute either an X or a Y chromosome
 female gamete ... only the female gamete provides cytoplasm to the zygote
 male ... the sperm can fertilize either a female egg or a male egg
 female gamete ... only the female gametes can have one of two functional sex chromosomes
 chromosome contribution from both parents ... the offspring uses all the parents' chromosomes
6 .       Human males are much more likely to have hemophilia (a failure of the blood to clot properly) than human females. This is because _____. (Concept 15.3E-Book) [Hint]

 hemophilia is a contagious disease to which males are more susceptible
 the gene for hemophilia is carried on the Y chromosome
 the gene for hemophilia is carried on an autosome
 hemophilia is the wild type
 the gene for hemophilia is carried on the X chromosome
7 .       Which of the following is correct with regard to aneuploidy? (Concept 15.4E-Book) [Hint]

 It's another name for inversion.
 It can be represented by 2n + 1.
 All aneuploid individuals die before birth.
 It can be represented by 4n.
 It involves only the autosomes.
8 .       If a fragment of a chromosome breaks off and then reattaches to the original chromosome at the same place but in the reverse direction, the resulting chromosomal abnormality is called _____. (Concept 15.4E-Book) [Hint]

 a deletion
 an inversion
 a translocation
 a nondisjunction
 polyploidy
9 .       A particular allele can have different effects if it is inherited from a male rather than a female. This phenomenon is known as _____. (Concept 15.5E-Book) [Hint]

 extranuclear inheritance
 aneuploidy
 sex linkage
 polyploidy
 genomic imprinting
10 .       Human mitochondria _____. (Concept 15.5E-Book) [Hint]

 are inherited as an X-linked trait
 are all inherited from the father
 have linear DNA
 do not contain DNA
 are all inherited from the mother





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