Cellular replication & Variation (PPT2-3) [U4/T1] Flashcards
1
Q
Define homologous pairs
A
- Identical in size, length, and centromere position
- Each member of the pair is a homolog (parental & maternal)
2
Q
CN3, PAGE 3, DIAGRAM
A
IDK
3
Q
CROSSING OVER
A
IDK
4
Q
INDEPENDENT ASSORTMENT
A
IDK
5
Q
What causes variation in sexual reproduction on a cellular level?
Describe…
A
Random Fertilisation:
- All gametes have half the number of chromosomes
- The half they have is randomly produced by meiosis
- Which sperm entering the egg creates variation
- Parents chromosomes are combined
6
Q
What causes variation in sexual reproduction on a chromosomal level?
A
- Independant assortment
- Crossing over
7
Q
Describe the process of independant assotment
A
- Align independant to all homologus pairs
- Seperate in a random matter
- Causes random mixing of blocks into gametes
8
Q
Describe the process of crossing over
A
- Prodcues new combinations of genetic information
- Provides variation as recombination is random
9
Q
List the similarities between Oogenesis (egg formation) and Spermatogenesis (sperm formation)
A
- Both produce haploid cells from diploid cell
- Produce functional gametes
- Two meiotic divisions
- Multiple mitotic divisions
- Occur in gonads
- hormones play a vital role
10
Q
List the differences between Oogenesis (egg formation) and Spermatogenesis (sperm formation)
A
- Timing
- Continuous and discontinuous
- Number of viable haploid cells (4 v 1)
- Lots of cytoplasm vs very little
- Precursor cell (spermatocyte vs. Oocyte)
11
Q
OOGENESIS DIAGRAM
CN4, PAGE 1
A
DIAGRAM
12
Q
SPERMATOGENESIS DIAGRAM
CN4, PAGE 2
A
IDK
