1.

Discuss the contribution of Sutton and Boveri by making a comparison between the behaviour of chromosomes and genes during meiosis, to explain Mendel’s Laws.

Answer»
  • Chromosomal theory of inheritance was proposed by Walter Sutton and Theodore Boveri (1902). 
  • It states that genes are located in the chromosomes and they segregate and assort independently during meiosis -1 and come together during fertilization along with chromosomes. 
  • Chromosomal theory of Sutton and Boveri explained that chromosomes are the carriers of genes and are the basis for Mendelian segregation and independent assortment. 
  • Chromosomes segregate during gametogenesis due to meiosis like Mendelian factors (Genes). These gametes become haploid; the diploid nature is returned in zygote due to random fertilization. 

They noted that the behavior of Mendelian factors (genes) was parallel to the behavior of chromosomes (Sutton chromosomes) during meiosis as mentioned below. 

1. Both genes and chromosomes occur in pairs. 

2. Both segregate at the time of gamete formation. 

3. Both genes and chromosomes show independent assortment.



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