Spermatogenesis is a lifelong process persisting in ageing men. But, the spermatogenic efficiency calculated by the count of spermatozoa... View Article
Chromosomes are inherited from parents to offspring. We contain 2 sets of chromosomes (2x23), one from each parent. At the time of gamete... View Article
Chromosomes can be identified by their size, centromere position and a specific banding pattern. Chromosomes are most distinct during the... View Article
Genes are the basic functional units of heredity. Genes are a segment of DNA. They are responsible for a specific trait and passed on from... View Article
We have two sets of chromosomes. One set is inherited from each parent. A pair of chromosomes are known as homologous chromosomes. They are... View Article
Homologous chromosomes have similar size and shape, they contain the same genes in the same order and at the same location but the alleles can be... View Article
Chromosomes mainly constitute DNA and histone proteins. DNA is wrapped around a core of histone octamer to form a nucleosome. Nucleosomes are the... View Article
Wilhelm Johannsen coined the term genes to describe the Mendelian factors. Gene is a functional segment of DNA, which codes for a protein.... View Article
Yes, multiple alleles can exist for a gene in a population but an individual (2n) contains only a pair of alleles. Examples are coat colour in... View Article
We can determine if a gene is assorting independently or not by determining the recombination frequencies. If genes are present on different... View Article
Order of genes on a chromosome can be determined by measuring the recombination frequencies. It helps in estimation of the distance between genes... View Article
Linked genes are those genes, which are present close together on the same chromosome and cannot assort independently at the time of gamete... View Article
The extra chromosome 21 is present in the Down syndrome. It occurs due to nondisjunction of the chromosome during cell division. At the time of... View Article
Barr body is formed as a result of inactivation of genes on one of the X chromosomes present in females. It is done to prevent the double... View Article
Females with XY karyotype with 46 chromosomes is a type of disorder known as Swyer syndrome or XY gonadal dysgenesis. They have normal external... View Article
