A. cloning
The rest relate to the change or identification of genes.
A certain bacterial mRNA is known to represent only one gene and to contain about 800 nucleotides. If you assume that the average amino acid residue contributes 110 to the peptide molecular weight, the largest polypeptide that this mRNA could code for would have a molecular weight of about _______.
A) 800.
B) 5,000.
C) 30,000.
D) 80,000.
E) An upper limit cannot be determined from the data given
Answer:
c. 30,000
Explanation:
The gene has a total of 800 nucleotides and would be transcribed into an mRNA having about 800 nucleotides. The nucleotides of mRNA are read in the form of genetic triplets. This means that the mRNA with 800 nucleotides would have about 800/3= 266.66 or 266 genetic codes. This mRNA would be translated into a polypeptide chain having around 266 amino acids.
One amino acid contributes 110 to the molecular weight. The total molecular weight of the largest possible polypeptide that can be encoded by the said gene would b 266 x 110= 29260 (around 30,000).
Answer:
Shows the flow of food and energy
The answer for this question would be choice <span>B) Water, rock, and surface materials, or the second option.</span>
A <u>Genetic cross</u> shows the possible outcomes, genotypes and phenotypes of offspring from two parents, and usually shown using a Punett Square.
Explanation:
A genetic cross is the resultant progeny that carries the genetic trait of each parent and obtained by crossbreeding of two organisms by mating them.
The two types of genetic crosses are – monohybrid (a single trait from each parent is crossed) and dihybrid (two traits are crossed) cross.
The organisms which are crossed can be with either be heterozygous (Rr) or homozygous (rr) alleles representing a trait; traits are either dominant (R) or recessive (r); the combination of genes for a particular trait results in a genotype (Rr); the resultant physical feature formed from the genotype is the phenotype.
The resultant crosses which can be obtained with the possible genotype and phenotypes are evaluated based on probability equations on the likelihood of possible specific offsprings to be formed due to the crossbreeding and according to the laws of genetics and Mendelian Inheritance. The results of the crossing are visually represented using a Punnet Square. The Punnet Square tabulates and summarizes all resultant probabilities from all possible combinations of maternal and paternal alleles.
