A person first crossed pure-bred Pea plants having Round-yellow seeds with Pure-bred pea plants having wrinkled-green seeds and found that only A-B type of seeds were produced in the F1 generation. When F1 generation pea plant having A-B type of seeds were crossed bred by self-pollination, then in addition to the original Round- yellow and wrinkled-green seeds, two new varieties. A-D and C-B type of seeds were also observed. i) What are A-B type of seeds? a. Round green b. Round yellow c. wrinkled yellow d. wrinkled green ii) State whether A and B are dominant traits or recessive traits. a. A (Round) and B (yellow) are dominant traits. b. A (Round) and B (yellow) are recessive traits. c. A (Round)Recessive and B (Yellow) are dominant traits d. A (Round) Dominant and B (yellow) are recessive traits iii) What are A-D type of seeds? a. Round green b. Round yellow c. Wrinkled yellow d. Wrinkled green iv) What are C-B type of seeds? a. Wrinkled green b. Wrinkled yellow c. Round yellow d. Round green v) The ratio of 4 different types of observed traits in a dihybrid cross is a. 1 : 3 : 3 : 9 b. 3 : 3 : 9 : 1 c. 9 : 1 : 3 : 3 d. 9 : 3 : 3 : 1
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Answer:
(a).A-B type of seeds are round-yellow.
(b).A (Round) and (B) yellow are dominant traits.
(c).A-D type of seeds are round green.
(d).C-B type of seeds are wrinkled yellow.
(e).In the F2 generations, (i) A-D type seeds will be produced in minimum numbers; (ii) A-B type of seeds will be produced in maximum numbers.
Answer:
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Explanation:
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A person first crossed pure-bred pea plants having round-yellow seeds with pure-bred pea plants having wrinkled-green seeds and found that only A-B type of seeds were produced in the F1 generation. When F1 generation pea plants having A-B type of seeds were cross-bred by self-pollination, then in addition to the original round-yellow and wrinkled-green seeds, two new varieties A-D and C-B type of seeds were also obtained.
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ANSWER
In F1 generation only the dominant traits are expressed. All of them are same genotypically and phenotypically because all are formed from the same kind of gametes.. But as the offsprings are crossbred the recessive characteristics start showing up in the phenotype to give new combinations. Many new genotypic and phenotypic combinations are made due to different kinds of gametes available
A punnets square can help in a better understanding of these new phenotypes. Hence we see yellow and round, yellow and wrinkled, green and round, green and wrinkled.

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