Alleles for genes located on mitochondrial DNA are said to be maternally inherited. What is the reason for this?

The egg contributes all of the cytoplasmic organelles to the zygote.

The major drawback of asexual reproduction is that it

producesless variation among offspring than does sexual reproduction.

Which of the following statements about Mendelian genetics is false?

Only two alleles can exist for a given gene.

At the milestone that defines metaphase, the chromosomes

line up at the equatorial plate

How does a nucleus in G2 differ from a nucleus in G1?

The G2 nucleus has double the amount of DNA as the G1 nucleus.

If Mendel had performed experiments on cattle,the patterns of inheritance would not have been easily detectable, because

cattle have small numbers of offspring.

Crossing of round-seeded peas with wrinkled-seeded peas resulted in progeny all with spherical seeds.This indicates that

wrinkled-seed trait is recessive.

The genotype of an organism that expresses a dominant trait can be determined by

crossing the organism with a homozygous recessive organism.

Which of the following statements about mitosis is true?

Two genetically identical daughter cells are formed.

One of the major contributions of Mendel to the study of genetics was

the use of statistics and probability to analyze data.

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Answers

1
Alleles for genes located on mitochondrial DNA are said to be maternally inherited. What is the reason for this?
The egg and sperm contribute equal numbers of organelles to the zygote.
The egg contributes all of the cytoplasmic organelles to the zygote.
Half of the nuclear chromosomes in the zygote come from the father.
Half of the nuclear chromosomes in the zygote come from the mother.
2
The approximate total number of genes in the human nuclear genome is closest to
240
24000
24
2400
3
The major drawback of asexual reproduction is that it
producesless variation among offspring than does sexual reproduction.
prevents change.
takes a great deal of time.
generates variation.
4
The physical appearance of a character is called
an allele.
the phenotype.
the genotype.
a trait.
5
Which of the following statements about Mendelian genetics is false?
Only two alleles can exist for a given gene.
Alternative forms of genes are called alleles.
Individuals with the same phenotype can have different genotypes.
A locus is a gene’s location on its chromosome.
6
If two strains of plants that have different alleles for a certain character are crossed, their progeny are called
the F2 generation.
F1 crosses.
the P generation.
the F1 generation.
7
At the milestone that defines metaphase, the chromosomes
separate.
come together.
are at opposite poles.
line up at the equatorial plate
8
The site on the chromosome occupied by a gene is called a(n)
phenotype.
region.
locus.
allele.
9
How does a nucleus in G2 differ from a nucleus in G1?
The G2 nucleus has double the amount of DNA as the G1 nucleus.
Inactive cells are arrested only in the G2 phase.
During G2, the cell prepares for S phase.
DNA synthesis occurs only in the G1 phase.
10
Different forms of a gene are called
alleles.
traits.
genotypes.
phenotypes.
11
If Mendel had performed experiments on cattle,the patterns of inheritance would not have been easily detectable, because
cattle reproduce asexually.
cattle do not have observable phenotypes.
cattle have small numbers of offspring.
cattle do not have genotypes.
12
Crossing of round-seeded peas with wrinkled-seeded peas resulted in progeny all with spherical seeds.This indicates that
wrinkled-seed trait is codominant.
Both codominant and recessive.
wrinkled-seed trait is dominant.
wrinkled-seed trait is recessive.
13
The genotype of an organism that expresses a dominant trait can be determined by
observing the phenotype of the progeny from any cross.
crossing the organism with a heterozygous dominant organism.
crossing the organism with a homozygous dominant organism.
crossing the organism with a homozygous recessive organism.
14
Mendel concluded that each pea has two units for each character, and each gamete contains one unit. This “unit” is a(n)
gene.
character.
transcription factor.
allele.
15
Which of the following statements about mitosis is true?
Two genetically identical daughter cells are formed.
The chromosome number in the resulting cells is halved.
It consists of two nuclear divisions.
DNA replication is completed in prophase.
16
At a certain locus of the human genome, 200 different alleles exist in the population. Each person has at most ______
1
200
2
100
17
One of the major contributions of Mendel to the study of genetics was
a complete description of the process of meiosis.
the finding that heritable traits combine or blend together.
the understanding that phenotypes are affected by the environment.
the use of statistics and probability to analyze data.
18
Segregation of alleles occurs
at fertilization.
during mitosis.
only in monohybrid crosses.
during gamete formation.

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