Name: ________________________ Class: ___________________ Date: __________ ID: A
6.3-6.6 Practice
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. Which of the following is an example of a biological trait?
a.
personality b.
hair style c.
eye color d.
regional accent
2. Mendel began his experiments with purebred pea plants. This approach enabled him to determine that variations among offspring were the result of a.
random mutations.
b.
self-pollination.
c.
genetic uniformity.
d.
his crossings.
3. When Mendel crossed plants that were purebred purple-flowered with plants that were purebred white-flowered, the resulting offspring all had purple flowers. When allowed to self-pollinate, this
F generation gave rise to white-flowered plants as well as purple. As a result, Mendel determined that individual traits are a.
inherited as discrete units.
b.
diluted in offspring.
c.
merged with successive generations.
d.
lost in the pollination process.
4. Mendel was able to identify predictable patterns of heredity. He succeeded mainly because he chose to study traits that a.
were always dominant.
b.
tended to be recessive.
c.
could be diluted.
d.
had only two forms.
5. Which of the following conclusions was a result of
Mendel's observations?
a.
Organisms that give rise to purebreds are genetically superior.
b.
Organisms that have intermediate features are self-pollinating.
c.
Organisms inherit two copies of each gene, one from each parent.
d.
Organisms that self-pollinate do not have
"either-or" features.
6. Which phrase best describes the term genome ?
a.
the genetic makeup of a chromosome b.
the genes that make up an organism c.
the location of a specific set of genes d.
the sum of an organism's physical traits
7. Hair color and eye color are examples of a person's a.
recessive traits.
b.
dominant alleles.
c.
genotype.
d.
phenotype.
8. 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.
9. If a pea plant were homozygous recessive for height, how would its alleles be represented?
a.
Tt b.
TT c.
tt d.
tT
10. An allele is dominant in a heterozygote when it is a.
expressed and the other allele is not.
b.
a very common allele in a population.
c.
the stronger of the two alleles.
d.
more desirable than the other allele.
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Name: ________________________
11. What do the letters inside the grid of a Punnett square represent?
a.
phenotypes of parents b.
genotypes of offspring c.
testcrosses of offspring d.
chromosomes of parents
12. What is the probability that the offspring of a cross between a homozygous recessive parent and a heterozygous parent will be homozygous recessive?
a.
1/1 b.
1/2 c.
1/4 d.
1/8
13. The term for a cross that involves just one trait, such as pod shape, is called a a.
homozygous cross.
b.
test cross.
c.
monohybrid cross.
d.
dihybrid cross.
14. What is the phenotypic ratio of a monohybrid cross between two heterozygous parents?
a.
3:1 b.
1:2:1 c.
9:3:3:1 d.
1:2:2:1
15. Which of the following observations did Mendel make as a result of his experiments with dihybrid crosses?
a.
Dominant traits are inherited together.
b.
Different traits are inherited separately.
c.
Similar traits are inherited in pairs.
d.
Recessive traits are inherited unpredictably.
16. About how many different combinations of chromosomes can be produced through the random fertilization of human gametes?
a.
2 4 x 2 4 b.
2 16 x 2 16 c.
2 23 x 2 23 d.
2 46 x 2 46
ID: A
17. Which phrase best describes the process of crossing over?
a.
Pairs of homologous chromosomes exchange segments.
b.
Pairs of sister chromatids exchange segments.
c.
Pairs of homologous chromosomes become linked.
d.
Pairs of sister chromatids become linked.
18. Suppose a gene that codes for flower color is linked with a gene that codes for leaf shape. Which statement is true of this pair of genes?
a.
They have similar loci on homologous chromosomes.
b.
They cross over separately during recombination.
c.
They are close together on the same chromosome.
d.
They likely will be inherited separately.
19. During what stage of meiosis does crossing over occur?
a.
prophase I of meiosis I b.
anaphase II of meiosis II c.
telophase I of meiosis I d.
metaphase II of meiosis II
20. Which of the following is a result of the study of gene linkage?
a.
The precise genes in the human genome have been mapped.
b.
The exact order of genes on a chromosome can be found.
c.
The relative distances between genes can be calculated.
d.
The specific characteristics of offspring can be predicted.
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6.3-6.6 Practice
Answer Section
MULTIPLE CHOICE
10. A
11. B
12. B
13. C
14. A
15. B
16. C
17. A
18. C
19. A
20. C
ID: A
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