Mendel discovered the fundamental laws of inheritance through his work on pea plants. He used around seven plant traits of which, length of the stem was also considered and hybridization between the tall plants (TT) and the dwarf plants (tt) was conducted.
Alleles refers to the alternative forms of a gene. They are the recessive and the dominant alleles. According to Medel's law of dominance, the recessive alleles are masked by the dominant alleles. In pea plants, the allele for tallness is dominant. It expresses itself in both the homozygous dominant condition and the heterozygous dominant condition. Thus, the possible genotypes of a tall pea plant are TT and Tt.
A DNA sequence that is 15 nucleotides long would normally give rise to a polypeptide sequence that would be 5 amino acids long. This is assuming that all the nucleotides in the DNA sequences are strictly coded to form only sense codons and not a single nonsense codon, also called termination codon
A sense codon is a set of three nucleotides also called a triplet, that codes for a particular amino acid. A DNA sequence of 15 nucleotides has 5 codons.
A nonsense or termination codon is one that does not code for any amino acid. There are three nonsense codons found on mRNA, and these are UAA, UAG and UGA. So if the DNA sequence has one of these, then the amino acids in the polypeptide chain will be 4 in number
Answer:
c. The cells of all organisms contain DNA that is housed in a membrane-bound nucleus.
Explanation:
DNA is the genetic material found in the cells of living organisms. Among the characteristics of the DNA that makes up the genetic code, it is said to be nearly universal though. DNA is said to be the "blueprint of life".
This means that the DNA sequence that encodes protein and useful information is the same in almost all living organisms. Hence, the statement that "cells of all organisms contain DNA that is housed in a membrane-bound nucleus is the" justification that fact that all organisms share some basic features and life processes is used by biologists to explain the idea that all life.
