Download App

Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYPrinciples of Inheritance and Variation1 Mark
MCQ
For question two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $\text{(a), (b), (c)}$ and $(d)$ as given below.
Assertion: Complementary genes are non-allelic genes.
Reason: Complementary genes interact to produce a completely new trait.
  • A
    Both assertion and reason are true and reason is the correct explanation of assertion.
  • ✓
    Both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    Assertion is true but reason is false.
  • D
    Both assertion and reason are false.
✓

Answer

Correct option: B.
Both assertion and reason are true but reason is not the correct explanation of assertion.
Complementary genes are those non-allelic genes which independently show a similar effect but produces a new trait when present together in the dominant form. $W$. Bateson and $R.C.$ Pun nett observed that, when two white flowered varieties of sweet pea, Lathyrus odoratus were crossed, $F_1$ progeny had coloured flowers. When $F$ Frogeny obtained from $F_1$ was classified, plants with coloured flowers and those with white flowers were obtained in $9: 7$ ratio. The two dominants are brought together in $F1$ generation and therefore coloured flowers are produced.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Assertion (A) & Reason (B) MCQ" from Principles of Inheritance and Variation→Principles of Inheritance and Variation — all question types→BIOLOGY STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Double fertilization is unique to angiosperms.
Reason: Triple fusion occurs in both fertilization, $i.e.$ first and second.
→
Human insulin is being commercially produced from transgenic species of $...........$
→
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Allogamy includes both geitonogamy and xenogamy.
Reason: Allogamy needs abiotic or biotic external agencies for pollination.
→
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: In $\text{GIFT},$ fertilisation takes place in vivo.
Reason: The results of $\text{GIFT}$ are less better than in vitro fertilisation.
→
For question two statements are given $-$ one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Many plants growing in oli gotroph ic soi Is possess mycorrhizae.
Reason : Mycorrhizae help in efficient absorption of nutrients.
→
For question, two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below. Assertion: $\text{tRNA}$ acts as an adapter molecule.
Reason: $\text{tRNA}$ recognizes codon sequence of $\text{mRNA}$ during translation.
→
For question two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: The introduction of Nile perch in lake Victoria caused cichlids to become extinct.
Reason: Nile perch is an indigenous species of East Africa.
→
Two statements are given $-$ one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : $\text{DNA}$ fingerprinting involves identifying differences in specific regions of $\text{DNA}$ sequence.
Reason : $\text{ DNA}$ fingerprinting is the basis of paternity testing.
→
For question, two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Subsequent encounter with the same pathogen elicits a highly intensified anamnestic response.
Reason: This is based on the fact that our body appears to have memory of the first encounter.
→
Two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Bacteriophage vectors are more advantageous than plasmid vectors.
Reason: Bacteriophage vectors can be easily detected at the time of cloning experiments.
→