Multiple Choice Questions

Two mice are heterozygous for albinism (Aa) . The dominant allele (A) codes for normal pigmentation, and the recessive allele (a) codes for no pigmentation. What percentage of their offspring would have an albino phenotype?
  • 1/16
  • none
  • 25
  • RR
Consider pea plants with the genotypes GgTt and ggtt . These plants can each produce how many type(s) of gametes? See Concept 14.2 (Page 277)
  • four ... one
  • 1 black : 1 orange
  • are all Rr
  • gametes, progeny
Which of the following is true about a plant with the genotype AABbcc? See Concept 14.1 (Page 271)
  • It is homozygous at two loci.
  • an alternative version of a gene
  • 48 chromosomes (24 from each parent, including one sex chromosome from each)
  • Cross the green-pod plant with a yellow-pod plant.
Various procedures can be used to detect genetic disorders before birth. Among the tests discussed in this chapter, which is the least invasive (list first), and which two allow the chromosomes of the fetus to be examined? See Concept 14.4 (Page 288)
  • a combination of polygenic inheritance and environmental factors
  • ultrasound imaging ... chorionic villus sampling ... amniocentesis
  • 0 homozygous black (BB): 1 heterozygote (black) (Bb): 1 homozygous orange (bb)
  • Red shows incomplete dominance over white.
If an organism with the genotype AaBb produces gametes, what proportion of the gametes would be Bb?
  • True
  • False
  • none
  • 1/16
The result of the following cross indicates that the genotype of the male parent is _____.
  • are all Rr
  • True
  • rr
  • recessive too
What number and types of chromosomes are found in a somatic cell in an animal with a diploid number of 48?
  • 48 chromosomes (24 from each parent, including one sex chromosome from each)
  • 0 homozygous black (BB): 1 heterozygote (black) (Bb): 1 homozygous orange (bb)
  • All of the gametes from a homozygote carry the same version of the gene while those of a heterozygote will differ.
  • a combination of polygenic inheritance and environmental factors
Which of these is a testcross?
  • are all Rr
  • It is homozygous at two loci.
  • A? x aa
  • False
If B represents the allele for black eyes (dominant) and b represents the allele for orange eyes (recessive), what would be the phenotypic ratio of a cross between a heterozygous black-eyed MendAlien and an orange-eyed MendAlien?
  • meiosis I, anaphase
  • gametes, progeny
  • 1 black : 1 orange
  • 0 homozygous black (BB): 1 heterozygote (black) (Bb): 1 homozygous orange (bb)
During which part of meiosis (meiosis I or meiosis II) do the two alleles of a gene separate? During which phase does the separation occur?State your answer as meiosis I or meiosis II followed by a comma and the name of the phase (for example, if your answer is meiosis II and metaphase, enter meiosis II, metaphase).
  • meiosis I, anaphase
  • four ... one
  • gametes, progeny
  • 1 black : 1 orange
The result of the following cross indicates that the genotype of the female parent is _____.
  • RR
  • True
  • are all Rr
  • recessive too
The result of the following cross indicates the orange eyes are _____ black eyes.
  • recessive too
  • rr
  • gametes, progeny
  • are all Rr
A tall, purple-flowered pea plant (TtPp) is allowed to self-pollinate. (The recessive alleles code for short plants and white flowers.) The phenotypic ratio of the resulting offspring is 9:3:3:What is the genotype of the plant whose phenotype appeared once out of every 16 offspring (the "1" in the 9:3:3:1 ratio)?
  • True
  • False
  • ttpp
  • 1/16
Two organisms with genotype AaBbCcDdEE mate. These loci are all independent. What fraction of the offspring will have the same genotype as the parents? See Concept 14.2 (Page 277)
  • False
  • ttpp
  • True
  • 1/16
Height in humans generally shows a normal (bell-shaped) distribution. What type of inheritance most likely determines height? See Concept 14.3 (Page 281)
  • ultrasound imaging ... chorionic villus sampling ... amniocentesis
  • 48 chromosomes (24 from each parent, including one sex chromosome from each)
  • a combination of polygenic inheritance and environmental factors
  • 0 homozygous black (BB): 1 heterozygote (black) (Bb): 1 homozygous orange (bb)
Which of the following do you expect if an individual is heterozygous for the sickle-cell trait? See Concept 14.3 (Page 285)
  • law of segregation
  • Mendel's law of segregation only
  • P ... F1 ... F2
  • He or she will show some symptoms of the disease.
That each gamete contains a single allele of the eye color gene is an illustration of _____.
  • law of segregation
  • It is homozygous at two loci.
  • an alternative version of a gene
  • Mendel's law of segregation only
If B represents the allele for black eyes (dominant) and b represents the allele for orange eyes (recessive), what would be the genotypic ratio of a cross between a heterozygous black-eyed MendAlien and an orange-eyed MendAlien?
  • 0 homozygous black (BB): 1 heterozygote (black) (Bb): 1 homozygous orange (bb)
  • 1 black : 1 orange
  • ultrasound imaging ... chorionic villus sampling ... amniocentesis
  • 48 chromosomes (24 from each parent, including one sex chromosome from each)
Suppose that the botanist carried out the test cross described in Parts A and B and determined that the original green-pod plant was heterozygous (Gg). Which of Mendel's findings does her test cross illustrate?
  • 1 black : 1 orange
  • law of segregation
  • meiosis I, anaphase
  • Mendel's law of segregation only
0 h : 0 m : 1 s

Multiple Choice Questions
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