compiled embryo

Question 1

the failure of a chromosomal pair to separate. It is the NUMBER ONE cause of CHROMOSOMAL ABNORMALITIES and will lead to TRISOMIES and MONOSOMY.

Answer 1

NON-DISJUNCTION

Question 2

DURING FERTILIZATION, the penetration of the OOCYTE will STIMULATE the COMPLETION of the 2ND MEIOTIC DIVISION and thus PRODUCING the MATURE OOCYTE. The CRUCIAL EVENT here is that the OOCYTE is ARRESTED in

Answer 2

METAPHASE II.

Question 3

a 7 hour CONDITIONING PERIOD that occurs in the FALLOPIAN TUBE to allow the SPERM to CROSS the CORONA RADIATA and thus the SPERM will UNDERGO the ACROSOMAL REACTION

Answer 3

CAPACITATION

Question 4

BEFORE BIRTH, the OOGONIA BEGIN MEIOSIS I, where this process of MEIOSIS I is HALTED in…

Answer 4

the PROPHASE I STAGE of the CELL CYCLE.

Question 5

AT OVULATION the OOCYTE will BEGIN the 2nd MEIOTIC DIVISION and is HALTED in…

Answer 5

METAPHASE II of the CELL CYCLE.

Question 6

IF AND ONLY WHEN FERTILIZATION OCCURS, you see COMPLETION of MEIOSIS II due to

Answer 6

the BLOCK or HALTED STAGE of METAPHASE II is REMOVED so that the OOCYTE can CONTINUE in its NORMAL CELL LIFE CYCLE.

Question 7

This # of SPERM will REACH the FERTILIZATION SITE and SURVIVE about 48 hours.

Answer 7

ONLY 200 SPERM

Question 8

DAY 4: The BLASTOCYST CAVITY form and will contain fluid that passes from the UTERUS through the

Answer 8

ZONA PELLUCIDA to form this CAVITY (BLASTOCYST CAVITY) and the FLUID in this CAVITY will INCREASE in AMOUNT to form a THIN OUTER LAYER and an INNER CELL MASS.

Question 9

the THIN OUTER LAYER aka the TROPHOBLAST is going to form and produce PLACENTAL TISSUE that will differentiate into the

Answer 9

SYNCTIOTROPHOBLAST and the CYTOTROPHOBLAST.

Question 10

the INNER CELL MASS is also known as the EMBRYOBLAST, it is this structure that contains AMNIOBLASTS that will line the AMNIOTIC CAVITY and will form the

Answer 10

HYPOBLAST (which is made up of cuboidal cells that will give rise to the EXTRA-EMBRYONIC-COELOM MEMBRANE) and the EPIBLAST (which is made up of tall columnar cells that eventually forms the AMNIOTIC CAVITY that will grow).

Question 11

SYNCYTIOTROPHOBLASTS will make and elaborate Beta HCG HORMONE in the

Answer 11

CORPUS LUTEUM to support the pregnancy for 2 months

Question 12

the SYNCYTIOTROPHOBLASTS also have LACUNAE that will form

Answer 12

BLOOD ISLANDS to establish a primitive and functioning FETAL-MATERNAL CIRCULATION.

Question 13

DAY 5:

EMBRYOBLAST: aka the INNER CELL MASS will form the

Answer 13

HYPOBLAST and the EPIBLAST

Question 14

DAY 6:
IMPLANTATION: aka the INNER CELL MASS will form the CYTOTROPHOBLAST and the OUTER CELL LAYER which will eventually become the

Answer 14

SYNCYTIOTROPHOBLAST.

Question 15

DAY 6:
The BLASTOCYST CAVITY attaches to the ENDOMETRIAL CAVITY to cause the proliferation of the TROPHOBLAST and will subsequently change its name and become the

Answer 15

UMBILICAL VESICLE aka the YOLK SAC.

Question 16

DAY 9:

This TIMEPOINT is where the LACUNAR SPACES will DEVELOP in the

Answer 16

SYNCYTIOTROPHOBLAST.

Question 17

DAY 11:
The SYNCYTIOTROPHOBLAST will appear and will form the ORIGIN and FRAMEWORK of the EARLY PRIMORDIAL UTERO-PLACENTAL CIRCULATION and this will LEAD to the FORMATION of the

Answer 17

PRIMARY CHORIONIC VILLI and also lead to the formation of the EXTRA-EMBRYONIC MESODERM that will form the BLOOD LACUNAE or BLOOD ISLANDS.