The term ‘Crossing over’ was used by Morgan and Cattell. It is a process in which there is exchange of chromosome segments between non-sister chromatids of a homologous chromosomes. It occurs during pachytene stage of prophase I of meiosis cell division.
Significance of crossing over:
- Crossing over provides genetic variation in all sexually reproducing organisms.
- It creates new combination of genes or genetic recombination and produces hybrids.
18% of 400 is 72
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Answer:
B) Messenger RNA
Explanation:
Messenger RNA [mRNA] molecules carry the coding sequences for protein synthesis and are called transcripts.Ribosomal RNA [rRNA] molecules form the core of a cell's ribosomes [the structures in which protein synthesis takes place] and transfer RNA [mRNA] molecules carry amino acids to the ribosomes during protein
