Deck 9: Germ Cells, Fertilization Sex

Question 1

Which of the options given is not true of Drosophila germ-line development?

A) Germ-line development begins in the anterior region of the egg
B) Germ cells are derived from pole cells.
C) Shifting the position of pole plasm shifts the position of germ cell specification
D) Germ cells are specified by inheriting cytoplasmic determinants

Answer 1

A

Question 2

How many distinct germplasm regions are present in a zebrafish embryo?

A) 1
B) 2
C) 3
D) 4

Answer 2

D

Question 3

Which of the options given represents the pathway of primordial germ-cell migration in the mouse embryo?

A) Hindgut - dorsal mesentery - primitive streak - genital ridge
B) Primitive streak - hindgut - dorsal mesentery - genital ridge
C) Dorsal mesentery - hindgut - primitive streak - genital ridge
D) Primitive streak - dorsal mesentery - hindgut - genital ridge

Answer 3

B

Question 4

Which of the options given is true of mammalian oogenesis?

A) Meiosis gives rise to four daughter cells of equal size
B) Meiosis is complete only occurs after fertilization
C) Meiosis gives rise to four genetically identical daughter cells
D) Meiosis is completed while the female is an embryo

Question 5

Which type of embryo is formed from the activation of an unfertilized egg?

A) Androgenetic
B) Gynogenetic
C) Parthenogenetic
D) Epigenetic

Question 6

Which of the following refers to the silencing of germ-cell-specific genes during early development?

A) Germ-cell suppression
B) Sex-specific inhibition
C) Genomic imprinting
D) Genetic printing

Question 7

What is the name of the Golgi-derived vesicle located in the head of sperm that aids in its penetration of the egg?

A) Cortical granule
B) Zona pellucida
C) Acrosome
D) Cumulus

Question 8

What is the name of the Golgi-derived vesicle located under the plasma membrane of an egg to block polyspermy?

A) Cortical granule
B) Zona pellucida
C) Acrosome
D) Cumulus

Question 9

Which ion controls the slow block to polyspermy?

A) Sodium
B) Calcium
C) Potassium
D) Chloride

Question 10

The presence of an SRY sequence in a mammalian genome causes the degradation of which of these structures?

A) Wolffian duct
B) Vas deferens
C) Sertoli cells
D) Müllerian duct