DNA
Meiosis Phases
Meiosis Phases cont.
Meiosis
DNA & Meiosis
100
What does DNA stand for and where is it located in eukaryotes?
DNA stands for Deoxyribonucleic Acid and is located in the nucleus
100
In what phase does "crossing over" occur?
Prophase I
100
Name the phase:
Prophase II
100
What is the result of Meiosis?
Four haploid cells
100
Which Nitrogenous base pairs with Adenine?
Thymine.
200
What is the structure of DNA and what does is resemble?
The structure is a double helix, and resembles a twisted ladder.
200
What is the order of the phases in Meiosis?
1. Interphase, Prophase I, Metaphase I, Anaphase I Telophase I, Cytokinesis
2. Prophase II, Metaphase II, Anaphase II, Telophase II, Cytokinesis
200
How many times does interphase occur?
1 time
200
What is the result of fertilization when two haploid cells fuse together?
A diploid zygote.
200
What is the purpose of meiosis?
The purpose is for the production of gametes.
300
What are the three components that make up DNA?
The three components that make up DNA are a 5 carbon sugar, a phosphate group, and a nitrogenous base
300
In what phase do the tetrads line up in the middle of the cell?
Metaphase I
300
Name this phase:
Metaphase II
300
What are the three sources of genetic variability?
1. Crossing Over
2. Independent Orientation of Chromosomes
3. Ramdom Fertilization
300
How many times does the DNA replicate and the nucleus divide?
The DNA replicates once and the nucleus divides twice.
400
What is the function of DNA?
The function of DNA provides genetic information for characteristics or traits
400
In what phases does the cell divide?
Cytokinesis
400
Name this Phase:
Telophase II
400
Where does crossing over occur on a pair of homologous chromosomes?
Chiasma
400
Which bonds connect the sugars and phosphate molecules?
Phosphodiester bond
500
What type of bond holds the nitrogenous bases pairs together?
Hydrogen bonds hold the nitrogenous bases together.
500
Describe anaphase I and anaphase II
Anaphase I:
The homologous chromosomes are pulled apart.
Anaphase II:
The sister chromatids are pulled apart.
500
Where do the spindle microtubules attach in Metaphase I.
They attach to the centromere with a kinetochore.
500
What is the disorder called due to a trisomy and which chromosome does it occur?
Down Syndrome and chromosome 21
500
What is the term when the individual strands form a right-handed double helix?
Antiparallel