Question

Describe the phenotypes and genotypes Ure 16. In watermelons, bitter fr atermelons, bitter fruit is dominant over sweet fruit, and yellow spots are dominant over no spots. ung these are independently assorted traits, a homozygous plant that produces fruit bitter with ow spots is crossed with a homozygous plant with fruit sweet and spotless. The F1 are intercrossed to produce F2. a. What are the phenotypic ratios in F2? b. If an F1 plant is backcrossed with the bitter, spotted parent, what offspring phenotypes are expected and with what proportions? Find C. If an F1 plant is backcrossed with the sweet, spotless parent, what offspring phenotypes are expected and with what proportions? ondition is

Answer 1

A. Phenotypic ratio of the F2 generation.

9:3:3:1

BB er Bb - Bitter frit; bb-sweet-frit - My or YY-Yellow shots , y4 - to no shop : BBYY Parents Boyy x BbYy ® by by by Carneten BY By by BBYYBBYY BbYY BbYy BbYY BbYy bbYY__ bbYy

9- bitter fruit and yellow-spotted; 3-Bitter fruit, no spot; 3- sweet fruit, yellow spot; 1- sweet fruit, no spot

B. All fruits are bitter and yellow-spotted

(b). BbY, _BY/BW) (63) _BBYY BBYY BbYY Phenotype - Bitter and spotted fruit All are bitter and botted frits. All) 16 h

Phenotype- All fruits are bitter and spotted fruit.

C. Phenotypic ratio- 1:1:1:1

- Bbly x bbyy I (4) BbYy - Bitter and spotted hat (4) Ubbyy - Sweet and no sfort 4) Bbyy - Bitter and no shot 14) bbl - Sweet and

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