A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4 then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population?

NEET-2019 Principles of Inheritance and Variation [class-xii ]

• 0.16 (AA); 0.36 (Aa); 0.48 (aa)
• 0.16 (AA); 0.48 (Aa); 0.36 (aa)
• 0.16 (AA); 0.24 (Aa); 0.36 (aa)
• 0.36 (AA); 0.48(Aa); 0.16 (aa)
Correct Option: B  [ 0.16 (AA); 0.48 (Aa); 0.36 (aa) ]

Remark:

Select the incorrect statement.

NEET-2019 Principles of Inheritance and Variation [class-xii ]

• In male grasshoppers, 50% of sperms have no sex-chromosome.
• In domesticated fowls sex of progeny depends on the type of sperm rather than egg.
• Human males have one of their sex-chromosome much shorter than the other
• Male fruit fly is heterogametic.
Correct Option: B  [ In domesticated fowls sex of progeny depends on the type of sperm rather than egg. ]

Remark:

Under which of the following conditions will there be no change in the reading frame of following mRNA?
5'AACAGCGGUGCUAUU3'

NEET-2019 Principles of Inheritance and Variation [class-xii ]

• Deletion of GGU from 7^th, 8^th and 9^th positions
• Insertion of A at G at 4^th and 5^th positions respectively
• Deletion of G from 5^th position
• Insertion of G at 5^th position
Correct Option: A  [ Deletion of GGU from 7^th, 8^th and 9^th positions ]

Remark:

What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia and is sterile?

NEET-2019 Principles of Inheritance and Variation [class-xii ]

• Edward syndrome
• Turner's syndrome
• Klinefelter's syndrome
• Down's syndrome
Correct Option: C  [ Klinefelter's syndrome ]

Remark:

Variations caused by mutation, as proposed by Hugo de Vries, are:

NEET-2019 Evolution [class-xii ]

• random and directionless
• random and directional
• small and directional
• small and directionless
Correct Option: A  [ random and directionless ]

Remark:

n a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3kg survive whereas 99% of the infants born with weights from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taking place?

NEET-2019 Evolution [class-xii ]

• Stabilizing Selection
• Directional Selection
• Disruptive Selection
• Cyclical Selection
Correct Option: A  [ Stabilizing Selection ]

Remark:

Match the hominids with their correct brain size :

NEET-2019 Evolution [class-xii ]

• (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
• (A)-(III), (B)-(II), (C)-(I), (D)-(IV)
• (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
• (A)-(IV), (B)-(III), (C)-(I), (D)-(II)
Correct Option: C  [ (A)-(III), (B)-(IV), (C)-(I), (D)-(II) ]

Remark:

Identify the correct pair representing the causative agent of typhoid fever and the confirmatory test for typhoid.

NEET-2019 Human-Health-and-Disease [class-xii ]

• Salmonella typhi/Widal test
• Salmonella typhi/Anthrone test
• Streptococcus pneumoniae/Widal test
• Plasmodium vivax/UTI test.
Correct Option: A  [ Salmonella typhi/Widal test ]

Remark:

Concanavalin A is:

NEET-2019 Human-Health-and-Disease [class-xii ]

• an alkaloid
• a lectin
• an essential oil
• a pigment
Correct Option: B  [ a lectin ]

Remark:

Which of the following immune responses is responsible for rejection of kidney graft?

NEET-2019 Human-Health-and-Disease [class-xii ]

• Cell-mediated immune response
• Inflammatory immune response
• Humoral immune response
• Cell-mediated immune response
Correct Option: A  [ Cell-mediated immune response ]

Remark: