Daniel D. Chiras: Human Biology, Fifth Edition: Practice Quizzes

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Title Text: Daniel D. Chiras: Human Biology, Fifth Edition

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Tools For Learning: Practice Quizzes

Please read each question and select your answer from the choices provided. You must complete all of the questions in order to view your results. At the end of each exam, you have the option to e-mail your results to your instructor.

1: Meiosis
	A: occurs in all body cells
	B: produces diploid gametes
	C: involves two cell divisions
	D: is identical to mitosis in all respects

2: Human somatic cells
	A: contain 23 chromosomes from the mother and 23 from the father
	B: are best described as haploid
	C: undergo meiotic divisions
	D: are genetically identical to germ cells

3: Meiosis I
	A: is identical to mitosis
	B: lacks a distinct metaphase
	C: reduces the number of chromosomes in humans from 46 to 23
	D: None of the above

4: In the ovary, the number of ova produced during meiosis is
	A: one
	B: two
	C: three
	D: four

5: The zygote produced during fertilization
	A: divides my meiosis
	B: is haploid
	C: divides by mitosis
	D: None of the above

6: Gregor Mendel studied heredity using the following organism
	A: fungi
	B: mice
	C: rabbits
	D: peas

7: During Mendel's time, many scientists believed
	A: that hereditary traits were either dominant or recessive
	B: that male and female gametes contributed equally to the characteristics of the offspring
	C: that blending of traits was a rare occurrence
	D: the female gamete had greater influence on the characteristics of the offspring than the male because it was larger

8: One of Mendel's key discoveries was that
	A: ova were larger than sperm
	B: organisms have two hereditary factors for all traits
	C: blending was a common occurrence in sexually reproducing organisms
	D: gametes contain two heredity factors for each trait

9: Mendel's principle of segregation is that
	A: gametes are produced in the gonads
	B: hereditary factors of the mother and father separate during gamete formation so that each gamete contributes only one heredity factor for each trait
	C: has been disproved by modern researchers
	D: None of the above

10: Which of the following is true?
	A: Alleles are similar forms of the same gene found on different chromosomes
	B: An individual containing two recessive genes for the same trait is considered to be homozygous dominant
	C: Recessive genes are expressed only when the dominant genes are missing
	D: In an individual who is heterozygous for a given trait, the recessive allele is missing

11: Which of the following is not true?
	A: The genotype of an organism is its genetic make up
	B: In a homozygous dominant individual, a recessive gene is present but not expressed
	C: Mendel determined that blending of traits was did not occur
	D: Phenotype does not always reflect a genotype

12: The phenotype of a heterozygous individual and a homozygous dominant individual is
	A: usually the same
	B: usually different
	C: identical to the homozygous recessive
	D: None of the above

13: The principle of independent assortment
	A: was discovered prior to Mendel's time
	B: applies to genes on different chromosomes
	C: explains the separation of hereditary factors during gamete formation
	D: a and b
	E: b and c

14: In a monohybrid cross between an individual with a genotype AA and Aa
	A: all offspring are heterozygous
	B: all individuals are homozygous dominant
	C: the recessive trait disappears
	D: all individuals are phenotypically similar

15: To determine the inheritance of two traits, a geneticist would use which experimental technique?
	A: a Punnett square
	B: a hybrid cross
	C: a dihybrid cross
	D: None of the above

16: Which of the following is true?
	A: Human cells contain one pair of sex chromosomes and 23 pairs of autosomes
	B: Autosomes refer to genes on the sex chromosomes
	C: Albinism is an autosomal-dominant trait
	D: All of the above
	E: None of the above

17: Cystic fibrosis
	A: is a genetic disease that affects the ducts that drain the pancreas
	B: results in degeneration of the pancreas
	C: patients typically suffer from malnutrition because of a lack of digestive enzymes
	D: results in difficulty breathing as a result of excess mucus production in the lungs
	E: All of the above

18: Which of the following is an example of incomplete dominance?
	A: Sickle-cell anemia
	B: Achrondroplasia
	C: Widows peak
	D: Albinism

19: Which of the following is true about sickle-cell anemia
	A: It is most common is Caucasians
	B: It occurs in individuals that are heterozygous for the trait
	C: Provides protection against malaria
	D: Is an example of an autosomal-dominant trait

20: Blood types are an example of
	A: multiple alleles
	B: sex-linked traits
	C: is an example of polygenic inheritance
	D: None of the above

21: Which of the following is an example of polygenic inheritance?
	A: Blood type
	B: Skin color
	C: Cystic fibrosis
	D: Albinism

22: Genes located on the same chromosome are said to be
	A: Homologous
	B: Recessive
	C: Autosomal
	D: Linked

23: Crossing-over
	A: occurs during mitosis
	B: increases genetic variation among offspring of sexually reproducing organisms
	C: occurs at the ends of the chromosomes
	D: occurs most frequently on genes that are close to one another on the chromosome

24: The Human Genome Project
	A: attempts to pinpoint the location of all genes in all species
	B: began in the early 1960's
	C: has been completed
	D: consists of two parts, the mapping of chromosomes and the determination of the sequence of all bases in human DNA

25: If a woman who carries the gene for color blindness (but is not color blind herself) has four children (two boys and two girls) with a man who does not carry the gene, what is the likelihood of one of her two boys having color blindness?
	A: One in four
	B: One in two
	C: One in three
	D: One in five

26: Which of the following is true regarding pattern baldness?
	A: The gene is present only in men
	B: The gene in women acts as if it were autosomal recessive, which is why pattern baldness is rare in women
	C: The pattern baldness gene acts the same in men and women
	D: None of the above

27: Nondisjunction of chromosomes
	A: usually results in the production of gametes with one additional chromosome
	B: typically results in a complete extra set of chromosomes
	C: is responsible for the condition known as pattern baldness
	D: occurs most commonly during mitosis

28: Which condition results from nondisjunction of the sex chromosomes?
	A: Cystic fibrosis
	B: Down syndrome
	C: Klinefelter's syndrome
	D: a and b
	E: a and c

29: Which of the following is not true about genetic disorders?
	A: They may be caused by deletions or losses of pieces of chromosomes
	B: They may result from translocations, pieces of chromosomes that break off and reattach elsewhere
	C: They can result from nondisjunction of sex chromosomes but not autosomes
	D: All of the above
	E: None of the above

30: Abnormalities in mitochondrial DNA
	A: can result in rare genetic disorders
	B: are passed on to offspring from mothers and fathers
	C: have little effect on offspring
	D: a and b
	E: b and c

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