The correct order of expression of the genes listed below in the determination of segmentation in Drosophila is "Hox genes > Gap genes > Pair rule genes > Segment polarity genes"
<u>Order: </u>2 > 3 > 4 > 1
<u>Explanation:</u>
The master regulator genes are that guide the creation of specific body segments or structures known as "Homeotic genes". Since these genes are active in segment patterning, the gap genes, pair-rule genes and segment polarity genes are designated as segmentation genes.
- Many animal homotic genes express transcription factor proteins that include a region called the homeodomain or Hox gene.
- The maternal impact genes express transcription factors which regulate the gap gene expression. The distance genes subdivide the embryo approximately along the anterior / posterior axis.
- The gap genes encode transcription factors which control the pair-rule expression of genes. The pair-regulated genes split the embryo into segment pairs.
- The pair-rule genes encode transcription factors which control the function of the polarity genes in the segment. The polarity genes in the segment determined each segment's anterior or posterior axis.
Answer:
is that sediment is a collection of small particles, particularly dirt, that precipitates from a river or other body of water while silt is mud or fine earth deposited from running or standing water.....Sedimentary rocks can contain fossils because, unlike most igneous and metamorphic rocks, they form at temperatures and pressures that do not destroy fossil remains.....Chemical sedimentary rocks form by precipitation of minerals from water. Precipitation is when dissolved materials come out of water. For example: Take a glass of water and pour some salt (halite) into it. ... This is a common way for chemical sedimentary rocks to form and the rocks are commonly called evaporites.
Explanation:
A. 1/4
You have Hh for both parents.
Mother: Hh
Father: Hh
You effectively have FOUR.
Energy requiring reactions can occur in biological systems because enzymes allow their coupling to other reactions<u> with products of lower free energy than the reactants</u>
Explanation:
Reactions which release energy are exergonic reactions and those that require energy are endergonic reactions. Exergonic reactions are with negative ∆G where the free energy (ability to do a work) of the products is lesser than the free energy of the reactants of the reaction.
To utilize the energy that is released during exergonic reactions, endergonic reactions couple with exergonic reactions in biological systems.
Exergonic reactions are spontaneous and can be coupled with endergonic reactions because their equilibrium constant remains greater than 1.
Answer:
They are usually found in the center and they are called embyro sacs.
Explanation: