Which of the following statements about meiosis are incorrect?
I, II and III
I and IV
All of them
II, III and IV
The diploid number of a koala (Phascolarctos cinereus) is 16.
How many autosomes are there in a koala's egg cell?
7
8
14
32
Which of the following gives an accurate definition of genetic recombination?
The orientation of homologous chromosomes as they align during metaphase I of meiosis
The development of new alleles within a population through mutation
The breaking and rejoining of DNA to create new combinations
The loss of DNA telomeres through multiple cycles of replication
Which of the following most accurately describes the events that occur in meiosis I?
|
Chromatids separate |
Chiasmata form in prophase I |
|
Chromatids separate |
Chiasmata form in metaphase I |
|
Homologous chromosomes separate |
Chiasmata form in prophase I |
|
Homologous chromosomes separate |
Chiasmata form in metaphase I |
The diagram shows a pair of homologous chromosomes at the beginning of prophase I of meiosis and four possible examples of crossing over, A - D
Which of the four representations of crossing over cannot occur in meiosis I?
Mitosis has many similarities to meiosis II. Which of the following statements describe(s) a difference between the cellular processes of mitosis and meiosis II?
|
I. |
During prophase, the nuclear envelope disintegrates and the chromosomes condense |
|
II. |
The ploidy of the cells entering the process |
|
III. |
Replication occurs immediately before each process, to double the amount of genetic material |
|
IV. |
During cytokinesis, the cytoplasm divides as new cell membranes are formed |
II only
I, II and III
III and IV
II and III
Exchange of alleles is an important feature of meiosis. During which precise event of meiosis does the exchange of alleles take place?
When a chiasma forms between two non-sister chromatids
At the assortment of homologous chromosomes at the cell equator
When gametes form in meiosis II
During gene linkage
For a eukaryotic organism with a diploid number of 14, which calculation would be required to establish how many combinations of chromosomes can occur through independent assortment in meiosis? All the equations below are mathematically correct.
2 x 7 = 14
27 = 128
214 = 16 384
214 x 27 = 2 097 152
Which row of the table puts these DNA-containing structures into the correct order of size?
| Largest ← Mid-sized → Smallest |
|
A |
bivalent & tetrad the same size |
chromosome |
chromatid |
|
B |
bivalent |
tetrad |
chromatid |
chromosome |
|
C |
tetrad |
chromosome |
bivalent |
chromatid |
|
D |
chromosome |
bivalent & tetrad the same size |
chromatid |
Which of the following cell types are haploid?
|
I. |
Primary spermatocyte |
|
II. |
Oocyte |
|
III. |
Spermatid |
|
IV. |
Spermatozoon |
II, III and IV
I and II
I, III and IV
All of them
