The approach of sequencing the whole set of genome, including all the coding and non-coding sequences in the Human Genome Project (HGP) is:
- Sequence Annotation: This is the process of identifying and marking specific regions in the genome, such as genes, regulatory sequences, and non-coding regions, within the entire genome sequence. The HGP aimed to sequence and annotate the entire human genome, including both coding and non-coding regions.
- Expressed Sequence Tags (ESTs): These are short sequences derived from cDNA, used mainly to identify genes that are actively being expressed. They are not part of the full genome sequencing process.
- Bioinformatics: This field applies computational methods to analyze and interpret biological data, including the analysis of genome sequences, but it is not the sequencing approach itself.
- DNA Polymorphism: Refers to the differences in DNA sequences among individuals within a species, not the complete sequencing and annotation of a genome.
Sequence Annotation
Sequence annotation is crucial for understanding the function of the genome. It helps in identifying genes, regulatory elements, and other functional sequences, and it provides a comprehensive map of the human genome, which is the ultimate goal of the Human Genome Project (HGP).
Regulation of lac operon by repressor is referred to as:
Explain how the addition of lactose in the medium regulates the switching on of the lac operon in bacteria.
Study the given molecular structure of double-stranded polynucleotide chain of DNA and answer the questions that follow.
(a) How many phosphodiester bonds are present in the given double-stranded polynucleotide chain?
(b) How many base pairs are there in each helical turn of double helix structure of DNA? Also write the distance between a base pair in a helix.
(c) In addition to H-bonds, what confers additional stability to the helical structure of DNA?
Read the following passage and answer the questions that follow. According to evolutionary theory, every evolutionary change involves the substitution of a new gene for the old one and the new allele arises from the old one. Continuous accumulation of changes in the DNA coding for proteins leads to evolutionary differences. The chemical composition of DNA is basically the same in all living beings, except for differences in the sequence of nitrogenous bases. Given below are percentage relative similarities between human DNA and DNA of other vertebrates:
(a) What is the term used for the substitution of a new gene for the old one and the new allele arising from the old one during evolutionary process?
(b) Which one of the following holds true for the data provided in the above table?
(c) [(i)] To which category of evolution (divergent or convergent) does the following relationship belong? Justify your answer.
Human and Rhesus Monkey
OR
[(ii)] Differentiate between Convergent and Divergent evolution.
Answer the following questions:
[(i)] Explain the structure of a mature embryo sac of a typical flowering plant.
[(ii)] How is triple fusion achieved in these plants?
OR
[(i)] Describe the changes in the ovary and the uterus as induced by the changes in the level of pituitary and ovarian hormones during menstrual cycle in a human female.