Answer:
The ability of sequences within the leader mRNA to pair with one another and form stem-lopp structures
Explanation:
A form of feedback regulation controls the trp operon by regulating transcription termination, a mechanism referred to as Attenuation.
-In the presence of high concentrations of tryptophan, RNA polymerase ceases transcription shortly after initiation in a region called the leader sequence.
-If the concentration of tryptophan is low, transcription does not terminate until the entire operon is transcribed. The mechanism of attenuation links alternative RNA secondary structures to transcription termination.
-Immediately after transcription, RNA from the leader region folds into one of two alternative secondary structures.
-One of these structures is a transcription termination signal that stops RNA polymerase from continuing to the end of the operon.
-The alternative structure does not contain a transcription termination signal and allows transcription of a single mRNA that encodes all the structural genes.
-The decision as to which of the two alternative RNA structures formed is regulated by the concentration of tryptophan.
If my memory recalls correctly. Its because of the nature of phospholipids and their double membrane layer. It basically "keeps" all the water from escaping, due to the double bilayer
Answer:
- Half (8/16) of the offspring will have gray fur and black eyes.
- Half (8/16) of the offspring will have gray fur and red eyes.
- None (0/16) of the offspring will have white fur.
Explanation:
For the purposes of this question, we will assume the following notation for the involved alleles:
G: gray fur (dominant), g: white fur (recessive).
B: black eyes (dominant), b: red eyes (recessive).
A GGbb rabbit may only produce one type of gametes, namely Gb.
A ggBb rabbit may produce either gB or gb gametes.
Since not all theoretical combinations are present, the resulting Punnett square may be simplified as follows:
| Gb
——-+-————
gB | GgBb
——-+-————
gb | Ggbb
As seen above, 100% of the offspring will have a Gg genotype (resulting in gray fur). As for eye color, half of them will have a Bb genotype (resulting in black eyes) whereas the other half will have a bb genotype (red eyes).
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