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 $F _1$ generation and reappears in the next generation. For example, when pea plants with round seeds $(R R)$ are crossed with plants with wrinkled seeds ( rr ), all seeds in $F_1$ generation were found to be round (Rr). When these round seeds were self-fertilized, both the round and wrinkled seeds appeared in $F_2$ generation in $3: 1$ ratio. Hence, in $F_1$ generation, the dominant character (round seeds) appeared and the recessive character (wrinkled seeds) got suppressed, which reappeared in $F_2$ 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
- Comment on the pattern in which all communities undergo a change in composition and structure with changing environmental conditions.
- Explain 'Climax community' and 'Sere'.
- Differentiate between primary and secondary succession with examples.
- Explain Darwinian theory of evolution with the help of one suitable example.
- State the two key concepts of the theory.
- Amongst pea tendril, Opuntia spines, lemon thorn and Cucurbita tendrils, which ones are homologous structures. Why do you call them so?
Your school’s athletic team along with the athletic teams from different schools reach the venue two days before the inter district school athletic event was to be held. A day before the competition, a team of officials from an agency arrive and ask for blood and urine samples from all the participating athletes.
- Would you support or object to this sample collection? Provide explanation to your answer.
- Write a note that you would like to read out to your team-mates to explain the purpose of this visit of these officials.
Explain the steps involved in the elongation of polypeptide chain during its synthesis.
Long Answer Questions
What is dihybrid cross? Explain with suitable example and checker board method.
What is dihybrid cross? Explain with suitable example and checker board method.
Absorption of water by roots from soil is with physical processes inhibition, diffusion and osmosis.
Draw a neat diagram of the female reproductive system and label the parts associated with the following (a) production of gamete, (b) site of fertilisation (c) site of implantation and, (d) birth canal.
Suggest some methods to assist infertile couples to have children.
Write on journey of water from soil to xylem in roots.
Describe pulmonary and systemic circulation.