A poultry farmer discovers that he has several chickens in thisflock whose legs
ID: 4971 • Letter: A
Question
A poultry farmer discovers that he has several chickens in thisflock whose legs are considerably shorter than normal. Heperforms many crosses and tallies the offspring produced. Youmay assume that all crosses of the same type gave the sameresult. The data are:crosses #with # with
shortlegs normal legs
normal xnormal 0 714
normal xshort 495 505
short xshort 101 50
From these data what seems to be the best explanation of theshort-legged trait? (Hint, check the ratios in each crossfirst. If any are unusual, consider what might cause that.)
Explanation / Answer
Tt X Tt-----TT, Tt. ,tt
TT X Tt-----TT, Tt.
SHORT –T, -dominant trait - ANSWER
NORMAL –t- recessive trait
crosses # with # with
shortlegs normal legs
normal xnormal 0 714
normal xshort 495 505
short xshort 101 50
==================================
normal xnormal 0 714
normal –tt X normal –tt
normal –tt
normal tt x short Tt.
T
t
t
Tt short
t t normal
t
Tt short
t t normal
shortlegs normal legs 495 505
shortx short
shortlegs normal legs 101 50
Tt short x short Tt
T
t
T
t
t
Tt short
t t normal
t
Tt short
t t normal
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