Genetics and Ans

Topics: Genetics, Meiosis, Allele Pages: 10 (1966 words) Published: January 2, 2015
Biology Test- Chapter 11: Introduction to Genetics

Multiple Choice
Identify the choice that best completes the statement or answers the question.

1.Gregor Mendel used pea plants to study
a.
flowering.
b.
gamete formation.
c.
the inheritance of traits.
d.
cross-pollination.

2.Offspring that result from crosses between true-breeding parents with different traits a.
are true-breeding.
b.
make up the F2 generation.
c.
make up the parental generation.
d.
are called hybrids.

3.The chemical factors that determine traits are called
a.
alleles.
b.
traits.
c.
genes.
d.
characters.

4.Gregor Mendel concluded that traits are
a.
not inherited by offspring.
b.
inherited through the passing of factors from parents to offspring. c.
determined by dominant factors only.
d.
determined by recessive factors only.

5.When Gregor Mendel crossed a tall plant with a short plant, the F1 plants inherited a.
an allele for tallness from each parent.
b.
an allele for tallness from the tall parent and an allele for shortness from the short parent. c.
an allele for shortness from each parent.
d.
an allele from only the tall parent.

6.The principle of dominance states that
a.
all alleles are dominant.
b.
all alleles are recessive.
c.
some alleles are dominant and others are recessive.
d.
alleles are neither dominant nor recessive.

7.When Gregor Mendel crossed true-breeding tall plants with true-breeding short plants, all the offspring were tall because a.
the allele for tall plants is recessive.
b.
the allele for short plants is dominant.
c.
the allele for tall plants is dominant.
d.
they were true-breeding like their parents.

8.A tall plant is crossed with a short plant. If the tall F1 pea plants are allowed to self-pollinate, a.
the offspring will be of medium height.
b.
all of the offspring will be tall.
c.
all of the offspring will be short.
d.
some of the offspring will be tall, and some will be short.

9.The principles of probability can be used to
a.
predict the traits of the offspring produced by genetic crosses. b.
determine the actual outcomes of genetic crosses.
c.
predict the traits of the parents used in genetic crosses.
d.
decide which organisms are best to use in genetic crosses.

10.In the P generation, a tall plant is crossed with a short plant. The probability that an F2 plant will be tall is a.
50%.
b.
75%.
c.
25%.
d.
100%.

11.Organisms that have two identical alleles for a particular trait are said to be a.
hybrid.
b.
homozygous.
c.
heterozygous.
d.
dominant.

Tt

T
t

TT

T

TT

Tt

T

TT

Tt

T
=
tall
t
=
short

Figure 11-1

12.In the Punnett square shown in Figure 11-1, which of the following is true about the offspring resulting from the cross? (Tt x TT) a.
About half are expected to be short.
b.
All are expected to be short.
c.
About half are expected to be tall.
d.
All are expected to be tall.

13.The genotypic ratio of the offspring in Figure 11-1 is: a.
2TT:2Tt
c.
1TT:2Tt:1tt
b.
2tall:2short
d.
3tall:1short

14.The phenotypic ratio of the offspring in Figure 11-1 is: a.
2TT:2Tt
c.
1TT:2Tt:1tt
b.
2tall:2short
d.
4 tall

15.A Punnett square shows all of the following EXCEPT
a.
all possible results of a genetic cross.
b.
the genotypes of the offspring.
c.
the alleles in the gametes of each parent.
d.
the actual results of a genetic cross.

16.If you made a Punnett square showing Gregor Mendel’s cross between true-breeding tall plants and true-breeding short plants, the square would show that the offspring had a.
the genotype of one of the parents.
b.
a phenotype that was different from that of both parents.
c.
a genotype that was different from that of both parents.
d.
the genotype of both parents.

17.What principle states that during gamete formation genes for...
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