Reproduction & chromosome transmission 2 Flashcards
Reproduction
Biological process by which new cells or new organisms are produced
Chromosomes
Structures within living cells that contain the genetic material
Chromatin
DNA within the chromsomes
Prokaryotes
Dont contain membrane bound organelles and dont have a nucleus
Nucleoid
Region of the cytoplasm where the prokaryotes chromosomes are held
Eukaryotes
Contain membrane bound organelles and also contain a nucleus
Cytogenetics
Field of genetics that involves the microscopic examination of chromosomes (Study of chromosomes)
Karyotype
Organized representation of chromosomes within a cell
Homozygous
Both homologs carry same allele (dominant or recessive)
Heterozygous
Homologs carry different alleles
Locus / loci
Physical location of a gene
Eukaryotic cells exhibit compartmentalization? What does this mean?
Contains membrane-bound organelles with specific function
How do you think the end results would be affected if the cells were not treated with a hypotonic solution in a cytogenetics experiment?
The chromosomes would not be spread out within the cell, and it would be more difficult to see them
How are homologs similar to each other and how are they different?
Similar: sequence of bases differs by <1%, identical in size, same banding, one gene found on both
Different: same gene but different alleles (versions of gene)
Which of the following is not found in a prokaryotic cell?
A plasma membrane
B ribosome
C cell nucleus
D cytoplasm
C
When preparing a karyotype, which of the following steps is conducted?
A treat cell with drugs to begin cell division
B treat cells with hypotonic soln to swell
C expose cells to chemical dyes that bind to chromosomes, stain
D All
D
How many sets of chromosomes are found in human somatic cell, how many are in 1 set?
A 2 sets of 23
B 23 sets of 2
C 1 set of 23
D 23 sets of 1
B
Asexual reproduction
How unicelluar cells divide to produce daughter cells
Binary fission
How bacteria divides to produce daughter cells
What is the process of binary fusion?
- Duplicate circular chromosome, distribute copy to each daughter cell
- FtsZ protein assembles into ring at septum site & recruits other proteins to form septum (new cell wall)
- The Mother cell divided into 2 daughter cells each with copy of chromosomal genetic materia
cell cycle
How Eukaryotic cells divide
What stages are in the Interphase?
- G1 phase
- S phase
- G2 phase
G1 phase
Cell prepare to divide
S phase
Chromosomes are replicated to form chromatids that are joined at centromere to form sister chromatids (dyad)
Chromatids
Two copies of chromosome
Centromere
Center joining sister chromatids together
Sister chromatids (dyad)
Two chromatids joined by centromere
Monad
Single chromatid within dyad, or an unreplicated chromosome
Kinetochore
Group of proteins bound to centromere, hold sister chromatids together
G2 phase
Cell accumulates materials necessary for nuclear and cell division
M phase (mitosis)
Distribute replicated chromosomes where each daughter receives same complement of chromosomes
Binary fission
A is a form of asexual reproduction
B is a way for bacteria to reproduce
C begins with a single mother cell and produces two genetically identical daughter cells
D All
D
Which of the following is the correct order of phases of cell cycle
A G1 G2 S M
B G1 S G2 M
C G1 G2 M S
D G1 S M G2
B