part A: Which of the following is not a structure that is part of secondary sex

Question

part A: Which of the following is not a structure that is part of secondary sex development?

a)Penis

b)Clitoris

c)Uterus

d)Ovary

e)Labia

part B: Which of the following contributes cells to the development of tubules in testes development?

a)Cardiogenic mesoderm

b)Metanephrogenic mesenchyme

c)Neural ectoderm

d)Mesonephros

e)Prechordal mesoderm

Part c: Which of the following groups of Drosophila genes are orthologues to the Hox genes in vertebrates?

a)Maternal effect genes

b)Homeotic selector genes

c)Gap genes

d)Segment polarity genes

e)Pair-rule genes

Explanation / Answer

Part A. ANS: d)Ovary

Explanation: Primary sex organs in a female consist of a pair of ovaries which are oval bodies lying at the back of the abdomen below the kidney. Each ovary consists of many ovarian follicles. Each follicle can produce an egg.

The secondary sex organs in a female are fallopian tubes, uterus, and vagina.

Secondary sex organs in a male are seminiferous tubules, epididymis, sperm duct, seminal vesicles, prostate gland, Cowper's gland and penis.

Part B. ANS: e)Prechordal mesoderm

Explanation: During the third and fourth weeks of embryonic development the mesoderm is established as the 2nd germ layer. The mesodermal cells are organized into 4 regions: the axial mesoderm of the prechordal plate and notochord, paraxial mesoderm, intermediate mesoderm and lateral plate mesoderm.

Neural tube   Intermediate mesoderm   gonads

a)Cardiogenic mesoderm cells helps in development of heart

b)Metanephrogenic mesenchyme cells helps in development of kidney

c)Neural ectoderm cells helps in development of neural tube

d)Mesonephros cells helps in development of kidney

Part C. ANS: b)Homeotic selector genes

Explanation: Homeotic selector genes confer segment identity in drosophila. They encode homeodomain proteins which interact with Hox and other homeotic genes to initiate segment-specific gene regulation.

Function of homeotic genes are responsible for the changes in the morphology of the limbs of arthropods as well as in the axial skeletons of vertebrates.

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