Overview Of Embryology

Question 1

Primordial germ cells begin to migrate from the yolk sac toward the developing gonads at what week?

a. Second week
b. First week
c. Third week
d. Fourth week

Answer 1

d. Fourth week

Question 2

The ff. are characteristic features of Turner Syndrome, EXCEPT

a. Short stature
b. Gynecomastia
c. None of the choices
d. Webbed neck

Answer 2

b. Gynecomastia

Question 3

Approximately how many days does it take the spermatogonium to become a mature spermatozoon?

a. 74
b. 21
c. 90
d. 46

Answer 3

a. 74

Question 4

The ff. pertains to the embryonic period, EXCEPT

a. There is emergence of the basic body plan
b. First 8 weeks of conception
c. None of the choices
d. Organs form fr. The three primary germ tissues

Answer 4

c. None of the choices

Question 5

When does oogenesis begin?

a. Begins at puberty
b. Fetal period
c. Begins before birth
d. Embryonic period

Answer 5

c. Begins before birth

Question 6

Which among the ff. has a maternal deletion?

a. Miller-Dieker syndrome
b. Pradar-Willi Syndrome
c. Angelman syndrome
d. Fragile X syndrome

Answer 6

c. Angelman syndrome

Question 7

The clinical features of Klinefelter syndrome detected by amniocentesis include the ff., EXCEPT

a. Gynecomastia
b. Sterility
c. Coloboma
d. Testicular atrophy

Answer 7

c. Coloboma

Question 8

Genetic variability is enhanced through crossover but not with the random distribution of homologous chromosomes to the daughter cells.

FALSE
TRUE

Answer 8

FALSE

Question 9

The ff. are examples of trisomy of an autosome, EXCEPT

a. Down syndrome
b. Patau Syndrome
c. Edward Syndrome
d. Klinefelter Syndrome

Answer 9

d. Klinefelter Syndrome

Question 10

Crossover, critical events in meiosis II, are the interchange of chromatid segments between paired homologous chromosomes

TRUE
FALSE

Answer 10

FALSE

Question 11

Teratomas are tumors of disrupted origin that may contain the ff., EXCEPT

a. Gut epithelia
b. None of the choices
c. Hair
d. Bone

Answer 11

b. None of the choices

Question 12

Fragile sites are regions of chromosomes that demonstrate a propensity to separate or break under certain cell manipulations

TRUE
FALSE

Answer 12

TRUE

Question 13

Primordial germ cells are divided fr. Which of the ff?

a. Ectoderm
b. Mesoderm
c. Hypoblast
d. Epiblast

Answer 13

d. Epiblast

Question 14

Genes on the same chromosome tend to be inherited together as known as

a. Autosomes
b. None of the choices
c. Linked genes
d. Homologous genes

Answer 14

c. Linked genes

Question 15

Which Meiosis I stage involves pairs of homologous chromosomes moving to the equator of the cell?

a. Telophase 1
b. Anaphase 1
c. Prophase 1
d. Metaphase 1

Answer 15

d. Metaphase 1