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In: Biology

You've discovered a new plant species in which yellow fruit color (Y) is dominant to green fruit color (y), and round fruit shape (R) is dominant to long fruit shape (r).

You've discovered a new plant species in which yellow fruit color (Y) is dominant to green fruit color (y), and round fruit shape (R) is dominant to long fruit shape (r). The genes for fruit color and shape are located on the same chromosome and are 12 m.u. apart.

Determine the proportions of progeny of each phenotype produced for this cross.

Yr/yR x yr/yr

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0%

6%

12%

25%

44%

50%

75%

88%

100%

1. yellow, round:25%

2. yellow, long:25%

3. green, round:25%

4. green, long:25%

Incorrect; Try Again;

You filled in 4 of 4 blanks incorrectly. If two genes are 12 map units apart, recombination takes place 12% of the time, and it does not take place 88% of the time. With this in mind, gametes produced by the Yr/yR individual would not be produced in equal proportions.

Expert Solution

Since the two genes are located 12 m.u. apart, only 12% of the gametes will be recombinant and 88% will be parental.

Thus, proportion of gametes produced from the parent with genotype Yr/yR will be –

6% -YR ; (recombinant)

6% - yr ; (recombinant)

44% - Yr ; (parental)

44% - yR. (parental)

All the gametes will be identical to the parent with genotype yr/yr i.e. 100% yr.

Yellow, round phenotype (Y_R_) will be produced by crossing gametes “YR” from parent 1 and “yr” from parent 2. Thus, 6% of the progeny will be yellow, round.
Yellow, long phenotype (Y_rr) will be produced by crossing gamtes “Yr” from parent 1 and “yr” from parent 2. Thus, 44% of the progeny will be yellow, long.
Green, round phenotype (yyR_) will be produced by crossing gamtes “yR” from parent 1 and “yr” from parent 2. Thus, 44% of the progeny will be green, round.
Green, long phenotype (yyrr) will be produced by crossing gamtes “yr” from parent 1 and “yr” from parent 2. Thus, 44% of the progeny will be green, long.

gladiator answered 2 years ago

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