Name the phenomenon that occurs when homologous chromosomes do not separate during meiosis. Non-disjunction.

Use your brain power What do you mean by homologous chromosomes?

During metaphase this change occurs in the chromosomes

Give an example of chromosomal disorder caused due to non-disjunction of autosomes.

In meiosis, chromosomes replicate during............... .

Read the statements given below and identify the concepts explained in them. Name the optical phenomenon behind occurrence of circles made of seven colours on the roads during rainy season.

In _______, recombinnation / crossing over occurs between homologous chromosomes.

Read the statements (A) Synapsis is the pairing of homologous chromosomes during zygotene (B) Synapsis is accompanied by formation of synaptonemal complex (C) The complex formed by a pair of synapsed homologous chromosomes is called a bivalent or a tetrad (D) Thefirst two stages of prophaseI are relatively short-lived compared to the next stage that is pachytene