A cross is made between an Hfr that is met+ thi+ pur+ and an F-that is met- thi- pur-. Interrupted mating studies show that met+ enters the recipient last, so met+ recombinants are selected on a medium containing supplements that satisfy only the pur and thi requirements.  These recombinants are tested for the presence of the thi+ and pur+ alleles. The following numbers of individuals are found for each genotype:

A) Gene Order	I	Thi Pur  Met
	II	Pur  Met  Thi
	III	Pur   Thi  Met
B) Distance between Pur and Thi	IV	15.4 map unit
	V	1.8 map unit

What is the following correct combination?

#Question id: 7174

#Unit 5. Developmental Biology

According to graph, which of the following statement is incorrect regarding to bicoid protein in drosophila?

#Question id: 7175

#Unit 5. Developmental Biology

The primitive streak is derived from epiblast cells and the central cells of Koller’s sickle. As the primitive streak extends rostrally, Henson’s node is formed. Following are few statements regarding this:

A. As endodermal ingression continues, the primitive streak starts to regress, moving Henson’s node from near the center of the area pellucida to a more posterior position.

B. As endodermal ingression continues, the primitive streak starts to regress, moving Henson’s node from near the periphery of the area pellucida to a more posterior position.

C. As mesodermal ingression continues, the primitive streak starts to regress, moving Henson’s node from near the center of the area pellucida to a more posterior position.

D. As mesodermal ingression continues, the primitive streak starts to regress, moving Henson’s node from near the periphery of the area pellucida to a more anterior position.

Which of the following statements are correct?

#Question id: 7176

#Unit 5. Developmental Biology

The metamorphic changes of frog development are brought about by following events.

(A) the secretion of the hormone thyroxine (T4) into the blood by the thyroid gland

(B) the degradation of T3 in the target tissues

(C) the conversion of (T4) into the more active hormone, triiodothyronine (T3) by the target tissues

Which of the following series is correct?

#Question id: 7177

#Unit 5. Developmental Biology

Following statements are regarding to the early development in nematodes. Which of the following is incorrect?

#Question id: 7178

#Unit 5. Developmental Biology

In sea urchin, the large micromeres are autonomously specified. They inherit maternal determinants that were deposited at the vegetal hemisphere of the egg; these become incorporated into the large micromeres at fourth cleavage. When an isolated animal hemisphere is combined with isolated micromeres, then what will be the result?

#Question id: 7179

#Unit 5. Developmental Biology

Blocking BMP(BMP2, BMP4, BMP7) signaling by infecting progress zone cells with retroviruses carrying dominant negative BMP receptors. Which of the following results are found?