Question
Explain the Law of Dominance using a monohybrid cross.
✓
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.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Answer the following questions:
Why is banana called a parthenocarpic fruit? Would you call banana a true fruit? Give reason in support of your answer.
Why is banana called a parthenocarpic fruit? Would you call banana a true fruit? Give reason in support of your answer.
Using various resources such as your school Library or the internet and discussions with your teacher, trace the evolutionary stages of any one animal say horse.
List three strategies that a bisexual chasmogamous flower can evolve to prevent self pollination (autogamy).
List the attributes that populations but not individuals possess.
What do you understand by conservation? Describe the methods how biological resources are conserved?
Discuss the role of healthy ecosystem services as a prerequisite for a wide range of economic, environmental and aesthetic goods and services.
OR
Describe the advantages for keeping the ecosystem healthy.In a pond, we see plants which are free-floating; rooted–submerged; rooted emergent; rooted with floating leaves. Write the type of plants against each of them.
| | Plant Name | Type |
| a. | Hydrilla | ____________ |
| b. | Typha | ____________ |
| c. | Nymphaea | ____________ |
| d. | Lemna | ____________ |
| e. | Vallisnaria | ____________ |
Write critical notes on the following :
(a) Eutrophication
(b) Biological magnification
(c) Ground water depletion and measures for its replenishment
(a) Eutrophication
(b) Biological magnification
(c) Ground water depletion and measures for its replenishment
Explain any three preventive measures to control microbial infections.
A flower of tomato plant following the process of sexual reproduction produce 240 viable seeds.
Answer the following questions giving reasons:
How many megaspore mother cells were involved?
Answer the following questions giving reasons:
How many megaspore mother cells were involved?