Quiz: Unit 3a - Patterns Of Heredity
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- 1.If a pea plant were homozygous recessive for height, how would its alleles be represented?
- A.
Tt
- B.
TT
- C.
Tt
- D.
TT
- 2.Genes that are located on the sex chromosomes are called ___.
- A.
Sex-linked
- B.
Alleles
- C.
Recessive
- D.
XY
- 3.A plant that is homozygous for red flowers (rr) is crossed with a plants that is homozygous for white flowers (ww). In the case of incomplete dominance, the flowers of the offspring will be ___.
- A.
Red and white
- B.
White only
- C.
Red only
- D.
Pink only
- 4.The term for a cross that involves just one trait, such as flower color, is ___.
- A.
A homozygous cross
- B.
A test cross
- C.
A monohybrid cross
- D.
A dihybrid cross
- 5.When an organism has two alleles at a particular locus that are different, the organism is called
- A.
Purebred
- B.
Dominant
- C.
Heterozygous
- D.
Recessive
- 6.An allele is dominant in a heterozygote when it is
- A.
Expressed and the other allele is not.
- B.
A very common allele in the population.
- C.
The weaker of the two alleles.
- D.
More desirable than the other allele.
- 7.Hair color and eye color are examples of a person's
- A.
Recessive traits.
- B.
Dominant alleles.
- C.
Genotype.
- D.
Phenotype.
- 8.What do the letters inside the grid of a Punnett square represent?
- A.
Phenotypes of parents
- B.
Genotypes of offspring
- C.
Test-crosses of offspring
- D.
Chromosomes of parents
- 9.Which law states that organisms inherit two copies of each gene and donate one copy to each of their offspring?
- A.
Law of genetic linkage
- B.
Law of segregation
- C.
Law of independent assortment
- D.
Law of inheritance
- 10.Recessive alleles may not be expressed because they are
- A.
Masked by the dominant allele.
- B.
The least common allele in a population.
- C.
The most common allele in a population.
- D.
Harmful to the organism.
- 11.Mendel's second law of genetics, the law of independent assortment, is one explanation of the
- A.
Random fertilization of gametes.
- B.
Genetic variation within species.
- C.
Greater strength of dominant alleles.
- D.
Final stages of gametogenesis.
- 12.Two parents have the genotype Gg for a genetic disorder caused by a dominant allele. What is the chance that any of their children will inherit the disorder?
- A.
25%
- B.
50%
- C.
75%
- D.
100%
- 13.For an XX female to express a recessive sex-linked trait, she must have
- A.
A Y chromosome.
- B.
An inactivated allele.
- C.
Two recessive alleles.
- D.
Two dominant alleles.
- 14.A child is born with attached earlobes, which is a recessive phenotype. Which of the following genotypes could the parents have?
- A.
RR and RR
- B.
Rr and RR
- C.
Rr and rr
- D.
RR and rr
- 15.What is the main reason that sex-linked disorders are most often observed in males?
- A.
The X chromosome only has genes for genetic disorders.
- B.
The Y chromosome cannot have genes that cause genetic disorders.
- C.
The Y chromosome cannot mask alleles on the X chromosome.
- D.
The X chromosome has genes only for sex determination.
- 16.
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Which pair of genes in Figure 6.2 would be most likely to be inherited together?- A.
A and B
- B.
A and C
- C.
B and C
- D.
B and D
- 17.Any of the alternative forms of a gene that occurs at a specific place on a chromosome are known as ___.
- A.
Alleles
- B.
Genes
- C.
Chromosomes
- D.
Recessive traits
- 18.A chart or "family tree" that tracks which members of a family have a particular trait is called a ___.
- A.
Pedigree
- B.
Punnett square
- C.
Genetic linkage
- D.
DNA sequence
- 19.___ studied traits of pea plants and discovered the two fundamental laws of genetics.
- A.
Mendel
- B.
Watson and Crick
- C.
Mack
- D.
Einstein
- 20.___ is a pattern of inheritance in which one allele is not completely dominant over the other, thereby creating a blended phenotype.
- A.
Incomplete dominance
- B.
Co-dominance
- C.
Multiple allele
- D.
Sex-linked
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