I believe the correct answer from the choices listed above is option 2. Abandoned farmland that once grew corn is now covered with bushes and small trees. These observed changes resulted directly from ecological succession. It <span> is the process of change in the species structure of an </span>ecological<span> community over time. </span>
Answer and Explanation: The farmer has a pure-breeding line of tomato means the farmer has a tomato with genotype FFrrtt while the other line of tomato has genotype ffRRTT.
The cross between these lines gives a F1 generation of heterozygous full, red and axial or FfRrTt.
With an individual of F1 crosses with another individual of F1, the Punnet Square will be:
FfRrTt x FfRrTt
1) Dividing each characteristics, for simplicity:
F f
F FF Ff
f Ff ff
R r
R RR Rr
r Rr rr
T t
T TT Tt
t Tt tt
Analysing Punnett squares, we notice the line wanted (ffrrTT) will be produced, when an individual of F1 generation cross with another individual with the same generation.
Answer:
According to the genetic code, the amino acids are the following:
- Glycine: encoded by GGC, GGA and GGG codons
-Arginine: encoded by AGA and AGG codons
-Lysine: encoded by AAA and AAG codons
-Glutamic acid: encoded by GAA and GAG codons
Explanation:
The probabilities to observe an amino-acid formed by Glutamic acid in the coding sequence is 2/9 for each codon
The right answer is A.
The term "hormonally active agent" (or endocrine disruptor) refers to any molecule or compound chemical agent, xenobiotic having hormono-mimetic properties and described as a cause of physiological abnormalities, and in particular reproductive abnormalities. Some examples are PCB, TCDD, DDT. Some of them were used as pesticides and are now banned for use. Their traces always exist at the soil level due to their persistence.
These agents are most often associated with breast cancer.
