Biology, asked by rubiroy1378, 10 months ago

Tihybrid cross er zenotype ratio

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Answered by Anonymous

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Q.Tihybrid cross er zenotype ratio

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ᴀ ᴅɪʜʏʙʀɪᴅ ᴄʀᴏss ᴛʀᴀᴄᴋs ᴛᴡᴏ ᴛʀᴀɪᴛs. ... ᴛʜᴇ ᴘʜᴇɴᴏᴛʏᴘᴇ ʀᴀᴛɪᴏ ᴘʀᴇᴅɪᴄᴛᴇᴅ ғᴏʀ ᴅɪʜʏʙʀɪᴅ ᴄʀᴏss ɪs 9:3:3:1. ᴏғ ᴛʜᴇ sɪxᴛᴇᴇɴ ᴘᴏssɪʙʟᴇ ᴀʟʟᴇʟᴇ ᴄᴏᴍʙɪɴᴀᴛɪᴏɴs: ɴɪɴᴇ ᴄᴏᴍʙɪɴᴀᴛɪᴏɴs ᴘʀᴏᴅᴜᴄᴇ ᴏғғsᴘʀɪɴɢ ᴡɪᴛʜ ʙᴏᴛʜ ᴅᴏᴍɪɴᴀɴᴛ ᴘʜᴇɴᴏᴛʏᴘᴇs.

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ᴀ sɪɴɢʟᴇ ᴛʀᴀɪᴛ ᴘᴜɴɴᴇᴛᴛ sϙᴜᴀʀᴇ ᴛʀᴀᴄᴋs ᴛᴡᴏ ᴀʟʟᴇʟᴇs ғᴏʀ ᴇᴀᴄʜ ᴘᴀʀᴇɴᴛ. ᴛʜᴇ sϙᴜᴀʀᴇ ʜᴀs ᴛᴡᴏ ʀᴏᴡs ᴀɴᴅ ᴛᴡᴏ ᴄᴏʟᴜᴍɴs. ᴀᴅᴅɪɴɢ ᴍᴏʀᴇ ᴛʀᴀɪᴛs ɪɴᴄʀᴇᴀsᴇs ᴛʜᴇ sɪᴢᴇ ᴏғ ᴛʜᴇ ᴘᴜɴɴᴇᴛᴛ sϙᴜᴀʀᴇ. ᴀssᴜᴍɪɴɢ ᴛʜᴀᴛ ᴀʟʟ ᴛʀᴀɪᴛs ᴇxʜɪʙɪᴛ ɪɴᴅᴇᴘᴇɴᴅᴇɴᴛ ᴀssᴏʀᴛᴍᴇɴᴛ, ᴛʜᴇ ɴᴜᴍʙᴇʀ ᴏғ ᴀʟʟᴇʟᴇ ᴄᴏᴍʙɪɴᴀᴛɪᴏɴs ᴀɴ ɪɴᴅɪᴠɪᴅᴜᴀʟ ᴄᴀɴ ᴘʀᴏᴅᴜᴄᴇ ɪs ᴛᴡᴏ ʀᴀɪsᴇᴅ ᴛᴏ ᴛʜᴇ ᴘᴏᴡᴇʀ ᴏғ ᴛʜᴇ ɴᴜᴍʙᴇʀ ᴏғ ᴛʀᴀɪᴛs. ғᴏʀ ᴛᴡᴏ ᴛʀᴀɪᴛs, ᴀɴ ɪɴᴅɪᴠɪᴅᴜᴀʟ ᴄᴀɴ ᴘʀᴏᴅᴜᴄᴇ 4 ᴀʟʟᴇʟᴇ ᴄᴏᴍʙɪɴᴀᴛɪᴏɴs (2^2). ᴛʜʀᴇᴇ ᴛʀᴀɪᴛs ᴘʀᴏᴅᴜᴄᴇ 8 ᴄᴏᴍʙɪɴᴀᴛɪᴏɴs (2^3). ɪɴᴅᴇᴘᴇɴᴅᴇɴᴛ ᴀssᴏʀᴛᴍᴇɴᴛ ᴛʏᴘɪᴄᴀʟʟʏ ᴍᴇᴀɴs ᴛʜᴇ ɢᴇɴᴇs ᴀʀᴇ ᴏɴ ᴅɪғғᴇʀᴇɴᴛ ᴄʜʀᴏᴍᴏsᴏᴍᴇ*s. ɪғ ᴛʜᴇ ɢᴇɴᴇs ғᴏʀ ᴛʜᴇ ᴛᴡᴏ ᴛʀᴀɪᴛs ᴀʀᴇ ᴏɴ ᴛʜᴇ sᴀᴍᴇ ᴄʜʀᴏᴍᴏsᴏᴍᴇ, ᴀʟʟᴇʟᴇs ғᴏʀ ᴇᴀᴄʜ ᴛʀᴀɪᴛ ᴡɪʟʟ ᴀʟᴡᴀʏs ᴀᴘᴘᴇᴀʀ ɪɴ ᴛʜᴇ sᴀᴍᴇ ᴄᴏᴍʙɪɴᴀᴛɪᴏɴs (ɪɢɴᴏʀɪɴɢ ʀᴇᴄᴏᴍʙɪɴᴀᴛɪᴏɴ).

ᴛʜᴇ ɢᴇɴᴏᴛʏᴘᴇ ɪɴ ᴇᴀᴄʜ ʙᴏx ɪs ᴇϙᴜᴀʟʟʏ ʟɪᴋᴇʟʏ ᴛᴏ ʙᴇ ᴘʀᴏᴅᴜᴄᴇᴅ ғʀᴏᴍ ᴀ ᴄʀᴏss. ᴀ ᴛᴡᴏ-ᴛʀᴀɪᴛ ᴘᴜɴɴᴇᴛᴛ sϙᴜᴀʀᴇ ʜᴀs 16 ʙᴏxᴇs. ᴛʜᴇ ᴘʀᴏʙᴀʙɪʟɪᴛʏ ᴏғ ᴀ ᴄʀᴏss ᴘʀᴏᴅᴜᴄɪɴɢ ᴀ ɢᴇɴᴏᴛʏᴘᴇ ɪɴ ᴀɴʏ ʙᴏx ɪs 1 ɪɴ 16. ɪғ ᴛʜᴇ sᴀᴍᴇ ɢᴇɴᴏᴛʏᴘᴇ ɪs ᴘʀᴇsᴇɴᴛ ɪɴ ᴛᴡᴏ ʙᴏxᴇs, ɪᴛs ᴘʀᴏʙᴀʙɪʟɪᴛʏ ᴏғ ᴏᴄᴄᴜʀʀɪɴɢ ᴅᴏᴜʙʟᴇs ᴛᴏ 1/8 (1/16 + 1/16).

ᴀ ᴄᴏᴍᴍᴏɴʟʏ ᴅɪsᴄᴜssᴇᴅ ᴘᴜɴɴᴇᴛᴛ sϙᴜᴀʀᴇ ɪs ᴛʜᴇ ᴅɪʜʏʙʀɪᴅ ᴄʀᴏss. ᴀ ᴅɪʜʏʙʀɪᴅ ᴄʀᴏss ᴛʀᴀᴄᴋs ᴛᴡᴏ ᴛʀᴀɪᴛs. ʙᴏᴛʜ ᴘᴀʀᴇɴᴛs ᴀʀᴇ ʜᴇᴛᴇʀᴏᴢʏɢᴏᴜs, ᴀɴᴅ ᴏɴᴇ ᴀʟʟᴇʟᴇ ғᴏʀ ᴇᴀᴄʜ ᴛʀᴀɪᴛ ᴇxʜɪʙɪᴛs ᴄᴏᴍᴘʟᴇᴛᴇ ᴅᴏᴍɪɴᴀɴᴄᴇ*. ᴛʜɪs ᴍᴇᴀɴs ᴛʜᴀᴛ ʙᴏᴛʜ ᴘᴀʀᴇɴᴛs ʜᴀᴠᴇ ʀᴇᴄᴇssɪᴠᴇ ᴀʟʟᴇʟᴇs, ʙᴜᴛ ᴇxʜɪʙɪᴛ ᴛʜᴇ ᴅᴏᴍɪɴᴀɴᴛ ᴘʜᴇɴᴏᴛʏᴘᴇ. ᴛʜᴇ ᴘʜᴇɴᴏᴛʏᴘᴇ ʀᴀᴛɪᴏ ᴘʀᴇᴅɪᴄᴛᴇᴅ ғᴏʀ ᴅɪʜʏʙʀɪᴅ ᴄʀᴏss ɪs 9:3:3:1. ᴏғ ᴛʜᴇ sɪxᴛᴇᴇɴ ᴘᴏssɪʙʟᴇ ᴀʟʟᴇʟᴇ ᴄᴏᴍʙɪɴᴀᴛɪᴏɴs:

ɴɪɴᴇ ᴄᴏᴍʙɪɴᴀᴛɪᴏɴs ᴘʀᴏᴅᴜᴄᴇ ᴏғғsᴘʀɪɴɢ ᴡɪᴛʜ ʙᴏᴛʜ ᴅᴏᴍɪɴᴀɴᴛ ᴘʜᴇɴᴏᴛʏᴘᴇs.

ᴛʜʀᴇᴇ ᴄᴏᴍʙɪɴᴀᴛɪᴏɴs ᴇᴀᴄʜ ᴘʀᴏᴅᴜᴄᴇ ᴏғғsᴘʀɪɴɢ ᴡɪᴛʜ ᴏɴᴇ ᴅᴏᴍɪɴᴀɴᴛ ᴀɴᴅ ᴏɴᴇ ʀᴇᴄᴇssɪᴠᴇ ᴘʜᴇɴᴏᴛʏᴘᴇ.

ᴏɴᴇ ᴄᴏᴍʙɪɴᴀᴛɪᴏɴ ᴘʀᴏᴅᴜᴄᴇs ᴀ ᴅᴏᴜʙʟᴇ ʀᴇᴄᴇssɪᴠᴇ ᴏғғsᴘʀɪɴɢ.

ᴛʜɪs ᴘᴀᴛᴛᴇʀɴ ᴏɴʟʏ ᴏᴄᴄᴜʀs ᴡʜᴇɴ ʙᴏᴛʜ ᴛʀᴀɪᴛs ʜᴀᴠᴇ ᴀ ᴅᴏᴍɪɴᴀɴᴛ ᴀʟʟᴇʟᴇ. ᴡɪᴛʜ ɴᴏ ᴅᴏᴍɪɴᴀɴᴛ ᴀʟʟᴇʟᴇs, ᴍᴏʀᴇ ᴘʜᴇɴᴏᴛʏᴘᴇs ᴀʀᴇ ᴘᴏssɪʙʟᴇ, ᴀɴᴅ ᴛʜᴇ ᴘʜᴇɴᴏᴛʏᴘᴇ ᴘʀᴏʙᴀʙɪʟɪᴛɪᴇs ᴍᴀᴛᴄʜ ᴛʜᴇ ɢᴇɴᴏᴛʏᴘᴇ ᴘʀᴏʙᴀʙɪʟɪᴛɪᴇs.

ᴀ sɪᴍᴘʟᴇʀ ᴘᴀᴛᴛᴇʀɴ ᴀʀɪsᴇs ᴡʜᴇɴ ᴏɴᴇ ᴏғ ᴛʜᴇ ᴘᴀʀᴇɴᴛs ɪs ʜᴏᴍᴏᴢʏɢᴏᴜs ғᴏʀ ᴀʟʟ ᴛʀᴀɪᴛs. ɪɴ ᴛʜɪs ᴄᴀsᴇ, ᴛʜᴇ ᴀʟʟᴇʟᴇs ᴄᴏɴᴛʀɪʙᴜᴛᴇᴅ ʙʏ ᴛʜᴇ ʜᴇᴛᴇʀᴏᴢʏɢᴏᴜs ᴘᴀʀᴇɴᴛ ᴅʀɪᴠᴇs ᴀʟʟ ᴏғ ᴛʜᴇ ᴠᴀʀɪᴀʙɪʟɪᴛʏ. ᴀ ᴛᴡᴏ ᴛʀᴀɪᴛ ᴄʀᴏss ʙᴇᴛᴡᴇᴇɴ ᴀ ʜᴇᴛᴇʀᴏᴢʏɢᴏᴜs ᴀɴᴅ ᴀ ʜᴏᴍᴏᴢʏɢᴏᴜs ɪɴᴅɪᴠɪᴅᴜᴀʟ ɢᴇɴᴇʀᴀᴛᴇs ғᴏᴜʀ ᴘʜᴇɴᴏᴛʏᴘᴇs, ᴇᴀᴄʜ ᴏғ ᴡʜɪᴄʜ ᴀʀᴇ ᴇϙᴜᴀʟʟʏ ʟɪᴋᴇʟʏ ᴛᴏ ᴏᴄᴄᴜʀ.

ᴍᴏʀᴇ ᴄᴏᴍᴘʟɪᴄᴀᴛᴇᴅ ᴘᴀᴛᴛᴇʀɴs ᴄᴀɴ ʙᴇ ᴇxᴀᴍɪɴᴇᴅ. ɪɴ ᴀɴ ᴇxᴛʀᴇᴍᴇ ᴄᴀsᴇ ᴡʜᴇɴ ᴍᴏʀᴇ ᴛʜᴀɴ ᴛᴡᴏ ᴀʟʟᴇʟᴇs ᴇxɪsᴛs ғᴏʀ ᴇᴀᴄʜ ᴛʀᴀɪᴛ ᴀɴᴅ ᴛʜᴇ ᴘᴀʀᴇɴᴛs ᴅᴏ ɴᴏᴛ ᴘᴏssᴇss sᴀᴍᴇ ᴀʟʟᴇʟᴇs, ᴛʜᴇ ᴛᴏᴛᴀʟ ɴᴜᴍʙᴇʀ ᴏғ ɢᴇɴᴏᴛʏᴘᴇs ᴇϙᴜᴀʟs ᴛʜᴇ ɴᴜᴍʙᴇʀ ᴏғ ʙᴏxᴇs ɪɴ ᴛʜᴇ ᴘᴜɴɴᴇᴛᴛ sϙᴜᴀʀᴇ.

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Answered by ITZINNOVATIVEGIRL98

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HEYA

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A dihybrid cross tracks two traits. ... The phenotype ratio predicted fordihybrid cross is 9:3:3:1. Of the sixteen possible allele combinations: Nine combinations produce offspring with both dominant phenotypes.

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Tihybrid cross er zenotype ratio