BIO 235 Exam 1 Questions With Verified
Answers
While undergoing mitosis, the ____ is the central regio on DNA that connects sister chromatids
Centromere
Homologous chromosome pairs...?
have a chromosome from mother and father, synapse during prophase of meiosis 1, same genes but
different alleles, pair of sister chromatids during prophase meiosis 1
What stage of the cell cycle does DNA replication occur in preparation for division?
S phase
What is one defining difference between DNA of G2 and G1 phases of the cell cycle?
G2 nucleus has 2 copies of each chromosome
How many centromeres exist in the G1 phase of a diploid organism with 24 chromosomes?
24
A mammal's gametes contain 24 chromosomes (1n=24) how many chromosomes would we expect to
find in its adult (somatic) cells?
48
Meiosis 2 results in a reduction, or halving of the number of chromosomes in each daughter cell.
False
List 2 of the mechanisms discussed in class by which meiosis produces genetic variation
1.random orientation/distribution of homologous chromosomes in anaphase 1
2. crossing over
What is a bivalent?
a pair of homologous chromosomes which consist of sister chromatids
How many chromatids are in 4 bivalents?
16
In meiosis, ___ separate during meiosis 1, and ___ separate during meiosis 2
homologous pairs, sister chromatids
When an allele masks another allele in a heterozygote, preventing expression of the masked allele,
this allele can be described as?
dominant
In plants, meiosis results in an entire haploid _____ generation from the diploid _____ generation
Answers
While undergoing mitosis, the ____ is the central regio on DNA that connects sister chromatids
Centromere
Homologous chromosome pairs...?
have a chromosome from mother and father, synapse during prophase of meiosis 1, same genes but
different alleles, pair of sister chromatids during prophase meiosis 1
What stage of the cell cycle does DNA replication occur in preparation for division?
S phase
What is one defining difference between DNA of G2 and G1 phases of the cell cycle?
G2 nucleus has 2 copies of each chromosome
How many centromeres exist in the G1 phase of a diploid organism with 24 chromosomes?
24
A mammal's gametes contain 24 chromosomes (1n=24) how many chromosomes would we expect to
find in its adult (somatic) cells?
48
Meiosis 2 results in a reduction, or halving of the number of chromosomes in each daughter cell.
False
List 2 of the mechanisms discussed in class by which meiosis produces genetic variation
1.random orientation/distribution of homologous chromosomes in anaphase 1
2. crossing over
What is a bivalent?
a pair of homologous chromosomes which consist of sister chromatids
How many chromatids are in 4 bivalents?
16
In meiosis, ___ separate during meiosis 1, and ___ separate during meiosis 2
homologous pairs, sister chromatids
When an allele masks another allele in a heterozygote, preventing expression of the masked allele,
this allele can be described as?
dominant
In plants, meiosis results in an entire haploid _____ generation from the diploid _____ generation
