Question

The homeotic genes in Drosophila Question 4 Not yet answered Marked out of 1.00 Rag question Select one: a. are expressed at the same level and at the same time in all parts of the developing embryo. ob, only include Hox genes. o care found only in Drosophila. d. determine the structural and functional characteristics of different segments of the developing fly. Question 5 Which evolutionary innovation was most significant in helping tetrapods move to dry terrestrial environments (ie, the transition over many generations from water to land)? Not yet answered Marked out of 1.00 Select one: Da bone P Rag question b. the jaw the amniotic egg d. endothermy e limb specialization

Answer 1

Ans) d determine the structural and functional charecteristics of different Segments of the developing fly.

Homeotic genes help. the the formation of body Segments during embryonic development. The homeotic genes code for various transcription factors that regulate genetic pathways.

Hox genes are found in other organisms too such as mice and humans and all bilaterally symmetrical organisms. And Hox genes are not the only genes with homeobox sequences, there are 200 homeotic genes including Hox genes.

Ans) e limb specialisation

Tetrapods evolved from marine life to terrestrial life due to limb specialisation that is hind limb movement. Tetrapods developed from finned organisms, and later developed exoskeleton and hind limbs.