Worksheets10.1 Meiosis (HL) IB Biology
Total questions: 20
Worksheet time: 10mins
What is a chiasma?
A point where homologous chromosomes remain in contact during meiosis
A point where gene mutations occur
A point where the recombination of genetic material always occurs
A process of exchanging genes between non-homologous chromatids
In which stage in meiosis is the chromosome number reduced from diploid to haploid?
During pairing of chromosomes in the first division of meiosis
During pairing of chromosomes in the second division of meiosis
When chromosomes move to opposite ends of the cell during the first division of meiosis
When chromosomes move to opposite ends of the cell during the second division of meiosis
Which response describes the behavior of chromosomes in metaphase I and Anaphase II of meiosis
A
B
C
D
T/F: A zygote is a sex cell.
Truee
False
Humans have a total of how many diploid chromosomes?
23 pairs
22 pairs
48 chromosomes
22 individual chromosomes
How is the doubling of chromosomes prevented in each generation?
Meiosis is a halving mechanism
Mitosis occurs
Body cells combine to form a zygote
All gametes are diploid
This is the attachment point between two sister chromatids
Centromere
Centriole
Chromatid
Chiasma
Crossing over results in... (select all that apply)
Genetic mutation
Recombination of alleles
Genetic diversity
Non-homologous chromosomes trading places
A homologous pair of chromosomes associates during Prophase I through synapsis and creates a...
Bivalent
Non-disjunction event
New chromosome
Histone Complex
How many chiasma are in this drawing?
2
3
4
5
T/F: Crossing over increases genetic variation through recombination, leading to more variety in gametes (sex cells).
True
False
Identify where this occurs: Each bivalent aligns independently at the equator.
Metaphase I
Metaphase II
Anaphase I
Anaphase II
Identify where this occurs: Pairs of sister chromatids align at the equator.
Metaphase I
Metaphase II
Anaphase I
Anaphase II
This image shows...
Two separate chromosomes
A bivalent
One pair of sister chromatids
Homologous chromosomes
Identify the phase
Prophase I
Anaphase II
Prophase II
Telophase II
What leads to the vast genetic diversity on our planet? (Select all that apply)
Crossing over
Random orientation
Mutations
Mitosis
What is non-disjunction?
A failure of chromosomes to separate at anaphase.
A hip new pop band.
When chromosomes pair up at the equator.
When chromosomes separate at anaphase
What is trisomy 21?
Too many chromosomes at Chromosome 21 (Down Syndrome)
Too many chromosomes at Chromosome X (Triple X- Syndrome)
A single chromosome at Chromosome 21
Non-disjunction of Chromosome 56
What is Mendel's Law of Independent Assortment?
Just because you get one allele for one gene, doesn't mean you'll get another allele for another gene. The genes are unlinked.
All genes come together regardless of where they are or what chromosome they are on.
All alleles are the same for the same species.
Gametes are guaranteed to get specific alleles on on every single chromosome.
What did Thomas Hunt Morgan contribute to the knowledge of genetics?
He determined that some genes are linked (you will get one if the other is present).
He determined that all genes are unlinked (you will never get certain genes because you have another).
He discovered what genes were.
He studied peas and determined that flower color was linked to plant height.
