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Suppose that a single gene controls fruit colour in mongo. Yellow fruit (Y-) is dominant to red
fruit(yy). Suppose a true breeding yellow mongo plant was crossed with a red-fruited plant and
the resulting F_1 was selfed. The F_2 segregation pattern was as expected. If one of the yellow-
fruited plant was randomly selected and selfed, what is the probability that the progeny would
segregate for fruit colour (i.e. red- and yellow-fruited progeny)? 3/4 2/3 1/4 1/2 none would
segregate
Solution
Answer: b). 2/3
Explanation:
Parents are true breeding means that they are homozygous so the F1 gen would be Yy
do a punnet and see that a self cross will produce YY, Yy. yY and yy out of the 4 possible there
are 3 that are yellow. One in 3 would be true breeding (all yellow offspring) and 2/3 would be
heterozygous and produce the typical 3:1 yellow to red offspring.
The F2 genotypes are YY (1/4), Yy(1/2) and yy (1/4). Thus, the yellow-fruited plant that was
randomly picked could be either YY or Yy. There is a 1/3 chance that it was YY and 2/3 chance
that it was Yy. If the YY plant was selected and selfed, the progeny would not segregate for fruit
color. If the Yy plant was selected, the progeny would segregate for fruit color.

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Suppose that a single gene controls fruit colour in mongo. Yellow fru.pdf

  • 1. Suppose that a single gene controls fruit colour in mongo. Yellow fruit (Y-) is dominant to red fruit(yy). Suppose a true breeding yellow mongo plant was crossed with a red-fruited plant and the resulting F_1 was selfed. The F_2 segregation pattern was as expected. If one of the yellow- fruited plant was randomly selected and selfed, what is the probability that the progeny would segregate for fruit colour (i.e. red- and yellow-fruited progeny)? 3/4 2/3 1/4 1/2 none would segregate Solution Answer: b). 2/3 Explanation: Parents are true breeding means that they are homozygous so the F1 gen would be Yy do a punnet and see that a self cross will produce YY, Yy. yY and yy out of the 4 possible there are 3 that are yellow. One in 3 would be true breeding (all yellow offspring) and 2/3 would be heterozygous and produce the typical 3:1 yellow to red offspring. The F2 genotypes are YY (1/4), Yy(1/2) and yy (1/4). Thus, the yellow-fruited plant that was randomly picked could be either YY or Yy. There is a 1/3 chance that it was YY and 2/3 chance that it was Yy. If the YY plant was selected and selfed, the progeny would not segregate for fruit color. If the Yy plant was selected, the progeny would segregate for fruit color.