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NEET Biology Solved Question Paper 2015

Multiple Choice Questions

61.

In angiosperms, microsprogenesis and megasporogenesis

occur in anther
form gametes without further divisions
Involve meiosis
Involve meiosis

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62.

Which of the following immunoglobulins does constitute the largest percentage in human milk?

1600 Views

63.

The cutting of DNA at specific locations become possible with the discovery of

Restriction enzymes
Probes
Selectable markers
Selectable markers

894 Views

64.

In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree.

Autosomal dominant
X-linked recessive
Autosomal recessive
Autosomal recessive

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65.
A colour blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson being colour blind?

0.5

1

Nil

Nil

Nil

When a colour blind (X^CY) marries to a woman with normal sight (XX) who has no family history of colour blindness, all of their sons will be normal pure and all of their daughters will be carriers as shown below:

So in the next generation, the children of all of their son will be normal in all conditions(except the case in which the wife involved is not carrier neither colour blind). For carrier daughters.
(i) If they many to a normal man 50% of their grandsons will become colour blind as

(ii) If carrier daughter marries to a colour blind man 50% of their grandson will be colour blind along with 50% of the grand daughter while rest 50% of the grand daughters will be carriers as

So in both the above cases, the result shows 50% of grand sons will be colour blind which in terms of over all progress (son + daughter) comes as 25% thus confirming the probability as 0.25.