Question

Question 1

Immediately at the moment when a sperm cell fertilises an egg (but before the cell can be called a zygote), how many chromatids are present in the cellular structure?

Select one:

a. 23

b. 46

c. 92

d. 69

Question 2

Which structure in a blastocyst which eventually develops into the chorion and placenta?

Select one:

a. Trophoblast

b. Inner cell mass

c. Nurse cell mass

d. Uterine lining

Question 3

What is determined first during prenatal development, chromosomal sex, gonadal sex, or where the anterior region is located?

Select one:

a. Chromosomal sex

b. Gonadal sex

c. Anterior region’s location

Question 4

Which of the following proteins is produced the first during development?

Select one:

a. Hox1

b. SRY

c. MIS hormone

d. Androgen receptor

Question 5

What do the MyoD and Hox6 genes have in common?

Select one:

a. Both are only transcribed in muscle tissue

b. Both encode proteins that themselves are transcription factors

c. Both are expressed in a segmented manner

d. Both are only transcribed during embryogenesis

Question 6

What is particular about bicoid mRNA?

Select one:

a. The egg cell receives this mRNA from Nurse cells before fertilization

b. The mRNA for bicoid can only be translated by ribosomes from the spermatozoa

c. The mRNA for bicoid is only translated in the cytosol

Question 7

What is the difference between polarity and segmentation?

Select one:

a. Polarity describes a relative location, while segments are fixed positions

b. Polarity is established by gene expression regulation, while segmentation is regulated by epigenetics

c. Polarity exists throughout an organism, while segmentation only applies to individual cells

d. Polarity describes the body, while segmentation describes appendages (limbs)

Answer 1

Question 1

Immediately at the moment when a sperm cell fertilises an egg (but before the cell can be called a zygote), how many chromatids are present in the cellular structure?

Answer: (a) 23.

Zygote contains two haploid set of chromosome which is 46 in number.

Question 2

Which structure in a blastocyst which eventually develops into the chorion and placenta?

Answer: (A) Trophoblast.

Trophoblast eventually develop into placenta. Before gastrulation, the cells of the trophoblast become differentiated into two strata.

Question 3

What is determined first during prenatal development, chromosomal sex, gonadal sex, or where the anterior region is located?

Answer: (A) Chromosomal sex.

Primary sex determination is the determination of the gonads. XX chromsome result in female and XY is for male.

Which of the following proteins is produced the first during development?

Answer : (B) SRY

The human Y chromosome showing the SRY gene is encodes the first protein that regulates sexual differentiation.

What do the MyoD and Hox6 genes have in common?

Answer: (b) Both encode proteins that themselves are transcription factors

Hox gene found in most animal homeotic genes that encode transcription factor proteins that contain a region called the homeodomain.

What is particular about bicoid mRNA?

Answer: (a) The egg cell receives this mRNA from Nurse cells before fertilization