An allele refers to different variants of a gene. An individual contains a pair of alleles. E.g. alleles for the gene for blood group are IA, IB... View Article
Cells are the basic structural and functional units of a living organism. According to recent estimates, there are around 37.2 trillion cells... View Article
Genes are present on chromosomes and are the basic unit of heredity. Each individual has 23 pairs (2n = 46) of chromosomes, which they inherit... View Article
Human genome consists of 3.16 billion base pairs present on 23 pairs of chromosomes in each cell. Only 2 percent of genome codes for proteins.... View Article
We inherit DNA from our parents. Genes are the basic unit of heredity. Genes are a short stretch of DNA sequence, which are expressed as a... View Article
There are 64 triplet codons present in mRNA. Out of 64 codons, 61 code for a specific amino acid in proteins and 3 code for termination of... View Article
Genetic variation increases by diversifying or disruptive selection in which natural selection favours two extreme phenotypes with specific... View Article
Genetic drift is the random fluctuation in the allelic frequencies of a population. Genetic drift results due to the change in gene frequencies... View Article
DNA is a polynucleotide. Each nucleotide is made up of deoxyribose sugar, a phosphate group and nitrogenous base. There are four different... View Article
Founder mutations are those mutations, which occured in the DNA of individuals, who were founders of that particular population. The founder... View Article
Haemophilia B is called Christmas disease after the name of the first patient who was diagnosed with the disease. It is due to deficiency of... View Article
Hemophilia is a sex linked recessive disease, which is due to lack of a protein involved in blood clotting cascade. Earlier without treatment,... View Article
Haemophilia is a sex linked inherited disorder. It is X-linked recessive disorder. Males have only one chromosome that they get from their mother... View Article
Hemophilia is sex linked recessive gene. It is linked to the X chromosome. There are 50% chances of a son to be hemophilic, if the mother is... View Article
Only 2% of human genome codes for protein. Junk DNA refers to the noncoding regions. The noncoding region is not really junk and performs... View Article
Identical twins have similar DNA as they are formed from the same sperm and egg. Identical twins are formed due to division of embryos into two.... View Article
No two people are exactly alike, even identical twins have variation in their genome due to environmental factors. Variation occurs due to... View Article
Mutations occur due to error during DNA replication and also due to environmental factors such as UV radiations. Mutations cause a change in the... View Article
All the chromosomes have a varying number of genes. In humans, chromosome 1 contains the maximum number of genes, i.e. 2968 and chromosome Y... View Article
