Oogenesis and Spermatogenesis

Question 1

Order of Oogenesis (occurs in female fetus before birth)

Answer 1

1. Oogonium (2n)
2. Primary Oocyte (undergoes Meiosis I)
3. Secondary Oocyte (and first polar body)
   * Secondary Oocyte undergoes Meiosis II)
4. Ovum (n) (and second polar body)

Question 2

what undergoes meiosis is oogenesis?

Answer 2

Primary oocyte

Question 3

what undergoes meiosis II in oogenesis?

Answer 3

secondary oocyte

Question 4

at what point is oogenesis arrested until the female reaches puberty?

Answer 4

primary oocyte

Question 5

Order of Spermatogenesis

Answer 5

1. Spermatogonium (2n)
2. Primary Spermatocyte
   * Undergoes Meiosis I
3. Secondary spermatocytes
   * Undergo Meiosis II
4. Sperm cells (n)

Question 6

what undergoes Meiosis I in spermatogenesis?

Answer 6

primary spermatocyte

Question 7

what undergoes meiosis II in spermatogenesis?

Answer 7

secondary spermatocyte

Question 8

Conditions that occur due to nondisjunction:

Answer 8

Down’s Syndrome (trisomy 21)
Turner’s syndrome (45X)
Kleinfelter’s syndrome (XXY)
trisomy 18

Question 9

four stages of early development

Answer 9

1. cleavage
2. implantation
3. gastrulation
4. neurulation

Question 10

stage of early dev

mitotic divisions of blastula?

Answer 10

cleavage

Question 11

stage of early dev

embryo implants during blastulation

Answer 11

implantation

Question 12

stage of early dev

forms 3 germ layers: ectoderm, endoderm, medoderm

Answer 12

gastrulation

Question 13

stage of early dev
germ layers develop a nervous system
forms from ectoderm of gastrula

Answer 13

neurulation