Question

How can we find the genotype of an organism by a test cross?

Answer 1

hєllσ dєαr.........



ᴀɴ ᴏʀɢᴀɴɪsᴍ's ɢᴇɴᴇᴛɪᴄ ᴍᴀᴋᴇᴜᴘ ɪs ᴄᴀʟʟᴇᴅ ɪᴛs ɢᴇɴᴏᴛʏᴘᴇ, ᴀɴᴅ ɪᴛ ʀᴇғʟᴇᴄᴛs ᴀʟʟ ᴏғ ᴛʜᴇ ᴀʟʟᴇʟᴇs, ᴏʀ ғᴏʀᴍs ᴏғ ᴛʜᴇ ɢᴇɴᴇ, ᴛʜᴀᴛ ᴀʀᴇ ᴄᴀʀʀɪᴇᴅ ʙʏ ᴛʜᴇ ᴏʀɢᴀɴɪsᴍ.


ᴄᴏɴsᴇǫᴜᴇɴᴛʟʏ, ᴀ ᴛᴇsᴛ ᴄʀᴏss ᴄᴀɴ ʜᴇʟᴘ ᴅᴇᴛᴇʀᴍɪɴᴇ ᴡʜᴇᴛʜᴇʀ ᴀ ᴅᴏᴍɪɴᴀɴᴛ ᴘʜᴇɴᴏᴛʏᴘᴇ ɪs ʜᴏᴍᴏᴢʏɢᴏᴜs ᴏʀ ʜᴇᴛᴇʀᴏᴢʏɢᴏᴜs ғᴏʀ ᴀ sᴘᴇᴄɪғɪᴄ ᴀʟʟᴇʟᴇ.

Answer 2

Test crosses are used to test an individual's genotype by crossing it with an individual of a known genotype. Individuals that show the recessive phenotype are known to have a homozygous recessive genotype. Individuals that show the dominant phenotype, however, may either be homozygous dominant or heterozygous.