Assuming ribose, thiamine, guanine and cytosine as choices.
Answer: Ribose
Explanation:
DNA can be defined as the genetic material of the living organism which carries the information that has to be carried from one generation to another generation.
Each nucleotide is made of three sub units:
It consists of nitrogenous bases. These bases are attached complementary to each other.
The other components are phosphate group and deoxyribose, which means that the oxygen is removed from the 2'OH group.
The main enzyme responsible for RNA synthesis is RNA polymerase, which <em>catalyzes the polymerization of 5'-triphosphate ribonucleosides (NTP) </em>directed by a DNA mold.
Eukaryotic cells contain <u>three types of nuclear RNA polymerases</u> that transcribe different types of genes. Protein-encoding genes are transcribed by RNA polymerase II to give mRNA.
The type of molecule is a covalent bond where the carbon has a greater affinity of the electrons than the hydrogen. The hydrogens would be slightly positive and the carbon would be slightly negative.
Let the dominant allele for the disease be 'T' and recessive allele be 't'.
The couple with normal phenotype produces an infant with the Tay Sach's disease.
As the disease is autosomal recessive in nature, it will get expressed in a homozygous recessive condition, that is, when the genotype is : tt.
As the normal parents are producing a diseased offspring, the both parents must be heterozygous dominant (Tt) for the disease allele.
The brother of the husband and the sister of the wife, both having a normal phenotype, can have the following genotypes, TT or Tt.
If either of the individual (brother or sister) has TT genotype and the other has other has either TT or Tt genotype, there is zero probability that they will produce an offspring with the disease.
T T and T T
T TT TT T TT TT
(N) (N) (N) (N)
T TT TT t Tt Tt
(N) (N) (N) (N)
If both the individuals have a Tt genotype, the probability to produce diseased offspring is one-fourth or 25%.
T t
T TT Tt
(N) (N)
t Tt tt
(N) (D)
(N) stands for normal and (D) stands for diseased phenotype.
