Meisosis, Fertilization and Development Flashcards
What have 23 individual chromosomes and are haploid cells
Gametes (sex cells)
Combination of a male and female gamete form a:
Zygote (diploid)
Meiosis produces haploid or diploid cells?
Haploid
Meiosis begins with what type of cells?
Diploid stem cells with one maternal and one paternal pair of chromosomes
Meiosis I ends with a haploid or diploid cell?
2 Haploid with either two copies of maternal chromosomes or two copies of paternal chromosomes
The tetrad (crossing over) happens at what stage of Meiosis
Meiosis I in Prophase I
Where does spermatogenesis occur
Seminiferous tubules
Describe the 5 stages of sperm formation
- Spermatogonium
- Primary spermatocyte
- Secondary spermatocytes
- Spermatids
- Spermatozoa
Name the process:
- Spermatogonium develops into Primary Spermatocyte by _________
- Spermatocytes develop into spermatids by _________
- Spermatids develop into spermatozoa by __________
- Mitosis
- Meiosis
- Spermiogenesis
Formation of female gametes is called _________
Oogenesis
When are oogonia produced?
In early fetal life
Name the process:
- Oogonium develop into primary oocytes by ________
- Oocyte develops into ovum by ________
- Mitosis
2. Meiosis
What 2 stages are oocytes arrested in?
Prophase I (before birth)
and
Metaphase II (ovulation)
What happens to the oocyte membrane immediately as an egg is fertilized?
Membranes of oocyte and sperm fuse. Membrane structure of oocyte changes so no more sperm can enter
What forms when male and female chromosomes combine
Zygote