Question

which of the following genotypes represent pure around seeds (1)tt(2)Tt(3)iT(4)RR​

Answer 1

Answer:

(1860's), in an Austrian monastery, there lived a monk named Mendel, Gregor Mendel. Monks had a lot of time on there hands and Mendel spent his time crossing pea plants. As he did this over & over & over & over & over again, he noticed some patterns to the inheritance of traits from one set of pea plants to the next. By carefully analyzing his pea plant numbers (he was really good at mathematics), he discovered three laws of inheritance.

Mendel's Laws are as follows:

1. the Law of Dominance

2. the Law of Segregation

3. the Law of Independent Assortment

Now, notice in that very brief description of his work that the words "chromosomes" or "genes" are nowhere to be found.  That is because the role of these things in relation to inheritance & heredity had not been discovered yet. What makes Mendel's contributions so impressive is that he described the basic patterns of inheritance before the mechanism for inheritance (namely genes) was even discovered.

Explanation:

Answer 2

Question: Which of the following genotypes represent pure round seeds?

(1) tt (2) Tt (3) tT (4) RR

The genotypes that represent pure round seeds are RR (option 4)

• There are two types of seed forms in pea plants: Round (R), a dominant trait, and Wrinkled (r), a recessive trait. In the F1 generation, a pure round pea (RR) and a pure wrinkled pea (rr) were cross-pollinated.
• When the F1​  plants are pollinated among themselves it is called selfing. The F2 plants contain both round and wrinkled individuals.
• Round seeds and wrinkled seeds happen to be present in a ratio of 3:1. So, the parents have genes for the traits of pure round (RR) and pure wrinkled (rr).

So, we can conclude that the genotypes that represent pure round seeds are RR (option 4)