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.(a) What are A-B type of seeds?
(b) State whether A and B are dominant traits or recessive traits.
(c) What are A-D type of seeds?
(d) What are C-B type of seeds?
(e) Out of A-B and A-D types of seeds, which one will be produced in (i) minimum numbers, and (ii) maximum numbers, in the F2 generation?
When pure-bred pea plants having round-yellow seeds (RRYY) crossed with pure-bred pea plants having wrinkled-green seeds (rryy),
(a) A-B type of seeds produced in the first generation (F1 generation) is round and yellow (RrYy).
(b) A (round) and B (yellow) are dominant traits, as they expressed themselves in F1 generation.
When F1 generation pea plants having A-B type of seeds, that is RrYy (round and yellow) were cross-bred by self-pollination, it produces original round-yellow (RRYY) and wrinkled-green (rryy) seeds, and two new varieties A-D and C-B type of seeds.
(c) A-D type of seeds produced are round and green (RRyy or Rryy) in nature.
(d) C-B type of seeds produced are wrinkled and yellow (rrYY or rrYy) in nature.
(e) In the F2 generation, out of A-B and A-D type of seeds, (i) A-D (round and green) types of seeds will be produced in minimum numbers and (ii) A-B (round and yellow) types of seeds will be in maximum numbers.
Related Articles
- Mendel first crossed pure-bred pea plants having round-yellow seeds with pure-bred pea plants having wrinkled-green seeds and found that only round-yellow seeds were produced in the F1 generation. When F1 generation pea plants having round-yellow seeds were cross-bred by self pollination, then peas having round-yellow seeds, round green seeds, wrinkled-yellow seeds and wrinkled-green seeds were produced. Mendel collected a total of 2160 seeds.(a) What will be the number of (i) round green seeds (ii) wrinkled green seeds (iii) round yellow seeds, and (iv) wrinkled-yellow seeds? (b) Which 'ratio' as established by Mendel have you made use of in answering the part (a) above?
- Pure-bred round-yellow pea seeds have genotype RRYY and the pure-bred wrinkled-green pea seeds have genotype rryy. Keeping this in mind, write the phenotypes of the following genotypes of hybrid pea seeds:(a) Rryy (b) rrYy (c) rrYY (d) RrYy (e) RRyy
- Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in F1 generation are then cross-bred to produce F2 generation of pea plants.(a) What do the plants of F1 generation look like? (b) What is the ratio of tall plants to dwarf plants in F2 generation? (c) Which type of plants were missing in F1 generation but reappeared in F2 generation?
- Mendel, In One of His Experiments with Pea Plants, Crossed A Variety of Pea Plant Having Round Seeds with One Having Wrinkled Seeds. State Mendel Observations Giving Reasons of F1 and F2 Progeny of This Cross. Also, List Any Two Contrasting Characters, Other Than the Round Seeds of Pea Plants That Mendel Used in His Experiments.
- The following results were obtained by a scientist who crossed the F1 generation of pure-breeding parents for round and wrinkled seeds.Dominant trait Recessive trait No. of F2 offspringRound seeds Wrinkled seeds 7524From these results, it can be concluded that the actual number of round seeds he obtained was:(a) 1881 (b) 22572 (c) 2508 (d) 5643
- Seeds of drumstick and maple are carried to long distances by wind because they possess(a) winged seeds(b) large and hairy seeds(c) long and ridged fruits(d) spiny seeds
- Pure-bred pea plants A are crossed with pure-bred pea plants B. It is found that the plants which look like A do not appear in F1 generation but re-emerge in F2 generation. Which of the plants A and B are: (i) tall, and (ii) dwarf? Give reason for your answer.
- Which of the following grow into a new plant in mushroom and mucor?(a) Spores(b) Roots(c) Seeds(d) Cuttings
- Write the importance of seeds in plants?
- Which of the following statements is/are false?a. Animals have greater powers of regeneration than plants. b. It is the thick walls of spores that help them survive adverse environmental conditions. c. No seeds are produced in the process of vegetative reproduction.(a) Only a(b) Only a and b(c) Only b(d) Only b and c(e) Only c
- Which of the following statement is or are incorrect?(a) The seeds and fruits of some of the plants are dispersed by water.(b) When the fruits are dispersed by an animal, the seeds present in them are automatically dispersed.(c) The fruits of xanthium and urena" plants are covered with numerous hooks due to which they are dispersed by animals.(d) None of the above."
- Name five types of seeds of plants which are used for making food.
- When two parents are crossed, the offspring are referred to as:(a) recessives (b) test cross (c) F1 generation (d) F2 generation
- Reena took some moong seeds and soaked them overnight in water. Next day, after draining out the water, she wrapped the seeds in a wet cloth. After one day, she observed a small white structures growing out of the seeds. These small white structures will develop into(A) Stems (B) Leaves (C) Roots (D) Flowers
- DIRECTIONS: Read the following three statements carefully and choose the correct option. (i) Moringa seeds are dispersed by wind. (ii) The seeds of balsam are dispersed by explosion. (iii) Seeds of coconut are dispersed by water.(a) Statements (i) and (iii) are incorrect but (ii) is correct.(b) Statements (i) and (ii) are incorrect but (iii) is correct.(c) All statements are correct.(d) All statements are incorrect.
Kickstart Your Career
Get certified by completing the course
Get Started
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies