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Solution


Q.

A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers but almost half of them were short. This suggests that the genetic make-up of the tall parent can be depicted as:
1 TTWW  
2 TTWw  
3 TtWW  
4 TtWw  

Ans.

(4)

This represents a parent that is heterozygous for both tallness and violet flower color. This genotype allows for the possibility of both tall and short offspring as well as violet and white flowers. However, since all progeny were violet, the white allele seems to have no effect in this cross, suggesting that the other parent must carry the recessive allele for white flowers.