18010.
Assertion: An organism with lethal mutation may not even develop beyond the zygote stage.
Reason: All types of gene mutations are lethal.
Both assertion and reason are true and the reason is the correct explanation of the assertion.
Both assertion and reason are true but the reason is not the correct explanation of the assertion.
Assertion is true statement but reason is false.
Both assertion and reason are false.
18011.The F2 generation offspring in a plant showing incomplete dominance, exhibit
variable genotypic and phenotypic ratios
a genotypic ratio of 1 : 1
a phenotypic ratio of 3 : 1
similar phenotypic and genotypic ratios of 1 : 2 : 1
18012.In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F1 generation?
3 : 1
50 : 50
9 : 1
1 : 3
18013.A common test to find the genotype of a hybrid is by:
Crossing of one F1 progeny with male parent
Crossing of one F2 progeny with male parent
Crossing of one F2 progeny with female parent
Studying the sexual behaviour of F1 progenies
18014.A person with unknown blood group under ABO system, has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid certificate of his own blood type, offers for blood donation without delay. What would have been the type of blood group of the donor friend?
Type A
Type B
Type AB
Type O
18015.Haemophilia is more commonly seen in human males than in human females because
This disease is due to a Y-linked recessive mutation
This disease is due to an X-linked recessive mutation
This disease is due to an X-linked dominant
A greater proportion of girls die in infancy
18016.A self-fertilizing trihybrid plant forms:
8 different gametes and 32 different zygotes
8 different gametes and 16 different zygotes
8 different gametes and 64 different zygotes
4 different gametes and 16 different zygotes
18017.Given below is a pedigree chart of a family with five children. It shows the inheritance of attached ear lobes as opposed to the free ones. The squares represent the male individuals and circles the female individuals. Which one of the following conclusions drawn is correct?
The parents are homozygous recessive
The trait is Y-linked
The parents are homozygous dominant
The parents are heterozygous
18018.Rh factor can produce life-threatening disease ______.
Erythroblastosis fetalis
Turner's Syndrome
AIDS
Sickle cell anemia
18019.Grain colour in wheat is determined by three pairs of polygene. Following the cross AABBCC (dark colour) x aabbcc (light colour), in F2-generation what proportion of the progeny is likely to resemble either parent
One fourth
Less than 5 percent
One third
None of these