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smack smack
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11 years ago
in pea plants tallness is dominant to shortness: the yellow seed trait is dominant to green. A tall, yellow seeded plant is crossed with a short, green seeded plant. it produces all tall, yellow seeded offsprring. one of these offspring is mated with a short, green seeded plant. what would be the phenotypic ratio of this cross?
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wrote...
11 years ago
The parental cross is TTYY x ttyy, and the F1 are all TtYy.  This is crossed with ttyy to produce a
1x4 Punnett square:

_____TY_____Ty_____tY_____ty_ ___
ty___TtYy___Ttyy___ttYy____tt yy___

Since there is no mention of crossing-over, we have to assume that the alleles assort independently, so the phenotypic ratio is 1:1:1:1.
wrote...
11 years ago
The question reads: TTYY (tall, yellow) x ttyy (short, green) Rightwards Arrow yields TtYy (tall, yellow) offspring. Cross this to ttyy (short, green).

You get 2 TtYy (tall, yellow) + 2 Ttyy (tall, green) + 2 ttYy (short, yellow) + 2 ttyy (short, green)
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