1.

Ɪғ ᴀ ᴘʟᴀɴᴛ ɪs ᴄʀᴏssᴇᴅ ᴀɴᴅ ᴘʀᴏᴅᴜᴄᴇᴅ ғɪғᴛʏ ᴛᴀʟʟ ᴀɴᴅ sᴇᴠᴇɴᴛᴇᴇɴ ᴅᴡᴀʀғ . ᴡʜᴀᴛ ᴄᴏᴜʟᴅ ʙᴇ ᴛʜᴇ ɢᴇɴᴏᴛʏᴘᴇ ɪɴ ғ1 ɢᴇɴᴇʀᴀᴛɪᴏɴ......ᴄʟᴀss x ᴄʜᴀᴘ - ʜᴇʀɪᴅɪᴛʏ ᴀɴᴅ ᴇᴠᴏʟᴜᴛɪᴏɴ...sᴜʙ - ʙɪᴏʟᴏɢʏ​

Answer»

Explanation:

A cross between pure BREEDING tall (TT) and dwarf (tt) plants produce all tall (Tt) plants in F1 PROGENY. These heterozygous tall plants produce 50% gametes with "T" allele and 50% with "t" allele. Random FUSION of these gametes from two heterozygous tall plants gives tall and dwarf plants in 3:1 ratio. out of 3/4 tall plants; 1/4 are HOMOZYGOUS tall (TT) and 2/4 are heterozygous tall (Tt). This makes the genotypic ratio for F2 generation as 1 homozygous tall (TT): 2 heterozygous tall (Tt): 1 homozygous dwarf (tt).



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