Download App

STD 12 - 4. principal of inheritance and variation — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 4. principal of inheritance and variation1 Mark
MCQ
$ABO$ blood grouping is controlled by gene I which has three alleles and show co­dominance. There are six genotypes. How many phenotypes in all are possible?
  • A
    Six
  • B
    Three
  • ✓
    Four
  • D
    Five
✓

Answer

Correct option: C.
Four
c
(c) : The three alleles $I^A$, $I^B$ and $i$ of gene $I$ in $ABO$ blood group system can produce six different genotypes and four different phenotypes as shown below : 

Genotypes Phenotypes

$I^AI^B$

$I^Ai$

 Blood group $A$

$I^BI^B$

$I^Bi$

 Blood group $B$
$I^AI^B$ Blood group $AB$
$i\ i$ Blood group $O$

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 "M.C.Q (1 Marks)" from STD 12 - 4. principal of inheritance and variation→STD 12 - 4. principal of inheritance and variation — all question types→Biology STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

After the release of the secondary oocyte, the Graafian follicle develops into:
→
How many number of pairs are correct?

$(1)$ Aves - eurythermal

$(2)$ Mammals - stenothermal

$(3)$ Amphibia - stenothermal

$(4)$ Reptile - eurythermal

→
Which of the following is incorrectly matched?
→
Variable number of tandem repeats $(VTNRs)$ in the $DNA$ molecule are highly useful in:
→
Mendel chose pea plants because
→
Name the target organ of Japanese encephalitis and $\ce{AIDS}$ virus respectively.
→
$A$ : Ethidium bromide helps in visualizing $DNA$ in $UV$ light only.

$R$ : This intercalating agent absorbs light in range $260 -330 \;nm.$

→
The food chain which begin with dead organic matter is called
→
Receptors for sperm binding in mammals are present on :
→
Which statement is correct about centre of origin of plants?
→