Question

Design a monohybrid cross and explain the law of dominance​

Answer 1

Answer:

Monohybrid cross :

Explanation:

It is a cross between two plants with one pair of contrasting traits.

Example:

A cross between a tall(TT) and a dwaf (tt) .Here TT has both dominant allele and tt has both recessive allele.

Conclusion:

• All plants are tall (Tt).
• A single copy of T is enough to make a plant tall.
• Triads like T are dominant allele and t is recessive.

Law of dominance

It states that when crossing occurs between organisms for contrasting traits, an organism with atleast one dominant allele will display the effect of dominant allele.

Hope this would help you.

Answer 2

Answer:

• Mendel’s law of dominance states that a dominant allele expresses itself in a monohybrid cross and suppresses the expression of recessive allele.
• However, this recessive allele for a character is not lost and remains hidden or masked in the progenies of F1 generation and reappears in the next generation.  
• For example, when pea plants with round seeds (RR) are crossed with plants with wrinkled seeds (rr), all seeds in F1 generation were found to be round (Rr).
• When these round seeds were self-fertilized, both the round and wrinkled seeds appeared in F2 generation in 3: 1 ratio.
• Hence, in F1 generation, the dominant character (round seeds) appeared and the recessive character (wrinkled seeds) got suppressed, which reappeared in F2 generation.