Question

In the following crosses write the characteristics of the progeny
A) RRYY x RRYY
B) RrYy x Rr Yy
C) rryy x rryy
D) RRYY x rryy
A. A Round yellow B Round yellow C Wrinkled green D Round yellow
B. A Round, yellow B wrinkled, green C Wrinkled yellow D Round yellow
C. A Round yellow B Round green C Wrinkled yellow D Wrinkled yellow
D. All of the above

Answer 1

Heredity, also called legacy or natural legacy, is the passing of characteristics from guardians to their posterity, either through agamic propagation or sexual generation. This heredity concept was first given by Mendel by working on pea plants.

Complete solution: The dominant allele is represented by capital letter while recessive trait is represented by small letter. For example, R stands for round that is the dominant trait while ‘r’ represents wrinkled seeds that is the recessive trait. Similarly, ‘Y’ represents the yellow colour of the seed and ‘y’ represents the green color of the seed.
The characteristics of the progeny are (a) Round, yellow, (b) Round, yellow, (c) Wrinkled, green, (d) Round, yellow. The crosses between different parents are described as follows:
-Guardians: RRYY x RRYY
Gametes: RY x RY
Posterity: RRYY (Round yellow)
-Guardians: RrYy x RrYy
Gametes: RY, Ry, rY, ry x RY, Ry, rY, ry
Posterity: RRYY, RRYy, RrYY, RrYy (Round yellow), RRyy, Rryy (Round green), rrYY, rrYy (Wrinkled yellow), rryy (Wrinkled green).
-Guardians: rryy x rryy
Gametes: ry x ry
Posterity: rryy (wrinkled green)
-Guardians: RRYY x rryy
Gametes: RY x ry
Posterity: RrYy (Round yellow)
So, the right answer is option (A) RRYY x RRYY

Note: Gregor Mendel, through his work on pea plants, discovered the essential laws of inheritance. He inferred that the characteristics come in pairs and are gained as specific units, one from each parent. Mendel followed the isolation of parental qualities and their appearance in the posterity as predominant or latent attributes. He perceived the numerical examples of legacy starting with one generation and then onto the next. Mendel's Laws of Heredity are typically,
-The Law of Segregation
-The Law of Independent Assortment
-The Law of Dominance.