Assertion : Phenylketonuria is a recessive hereditary disease caused by the body’s failure to oxidize an amino acid phenylalanine to tyrosine, because of a defective enzyme.

Reason : It results in the presence of phenylalanine acid in the urine.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
  • 1
  • 2
  • 3
  • 4

Assertion   :       In honey bee, life history shows natural and complete parthenogenesis.

Reason      :       In honey bee, both drones and workers are parthenogenetically developed.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
  • 1
  • 2
  • 3
  • 4

In a true breeding the allelic pair of genes are

  • Homologous

  • Linked
  • Stable
  • Homozygous

A test cross is done to find out:

  • Fitness of an organism

  • Genotype of a plant expressing dominant phenotype

  • The suitable parents for a Mendelian Cross

  • The hidden genotypic ratio of F2 phenotypes

What is the ratio of a typical monohybrid test cross?

  • 2 : 1

  • 3 : 1

  • 1: 2 : 1                

  • 1 : 1

The law of Segregation is based on the fact that

  • The alleles do not show any blending

  • There is random fertilization

  • Gametes are pure for the trait

  • The zygotes are diploid

The inheritance of flower colour in dog flower and 4’O clock plant exhibits:

  • Complete dominance

  • Incomplete dominance

  • Co-dominance

  • Lethality

In complete dominance, the recessive allele with respect to the dominant allele:

  • Produces no product

  • Produces a different product

  • Produces half the product

  • Produces no product or a non-functional product

The number of alleles, the genotypic combinations and phenotypes in ABO system is respectively:

  • 3, 6 and 4

  • 3, 4 and 6                            

  • 2, 3 and 4            

  • 2, 3, and 6

Suppose a gene has seven alleles. What would be the number of alleles in an individual at any instant?

  • 1

  • 7

  • 2

  • 3

In case of starch synthesis in pea seeds [controlled by B gene], BB homozygotes produce large and round starch grains; bb homozygotes produce smaller and wrinkled starch grains and Heterozygotes produce round seeds of intermediate size. What can be inferred from this observation?

  • The gene B mutates at a faster rate.

  • The gene B is easily influenced by the environment

  • Dominance is not an autonomous feature of a gene or the product that it has information for

  • Some genes do not follow the law of segregation

 

When Mendel self hybridized F1 progeny of a dihybrid cross between pure Yellow Round seeded plants and Green Wrinkled plants, he observed that yellow and green colour segregated in a ratio of:

  • 1 : 1

  • 3 : 1

  • 9 : 3 : 3 : 1

  • 1 : 2 : 1

In 1900 Mendel’s work was rediscovered by:

  • Korana, Nirenberg and Mathei

  • De Vries, Correns and von Tschermak

  • Avery, McCleod and McCarty

  • Watson, Crick and Wilkins

Genes tightly linked on the same chromosome show:

  • Very high recombination

  • Independent assortment

  • Very low recombination

  • 50 % recombination

 

In humans, the mechanism of sex determination is:

  • XX – XY; male heterogamety

  • XX – XY; female heterogamety

  • XX – XO; male heterogamety

  • XX – XO; female heterogamety

 

A couple has a daughter. What is the probability that their next child will be a daughter?

  • 0 %

  • 25 %

  • 50 %

  • 100 %

 

Thalesemia is inherited as a/an ____________ condition.

  • Autosomal recessive

  • Autosomal dominant

  • Sex linked recessive

  • Sexlinked dominant

 

The point mutation in sickle cell anaemia leads to a change in codon. Identify the correct change:

  • UGA to UAA

  • GUG to GAG

  • GAG to GUG

  • UAA to UGA

 

In sickle cell anaemia, the mutant haemoglobin molecule undergoes

  • Polymerisation under low oxygen tension causing that changes the shape of the RBC to sickle like structure

  • Depolymerisation under low oxygen tension causing that changes the shape of the RBC to sickle like structure

  • Denaturation under high oxygen tension causing that changes the shape of the RBC to sickle like structure

  • Denaturation

In Phenylketonuria,
I. Phenylpyruvic acid and other derivatives are accumulated in brain resulting in mental retardation.
II. These are also excreted through urine because of its poor absorption by kidney.

  • Only I is correct
  • Only II is correct
  • Both are correct
  • Both are incorrect

 

When there is a change in chromosome number such that the changes number is not an exact multiple of base number [haploid number], the condition is called as:

  • Euploidy

  • Aneuploidy

  • Aberration

  • Non-disjunction

 

The number of autosomes in a human egg would be:

  • 22

  • 23

  • 1

  • 2

An individual affected by Klinefelter’syndrome:

  • Has 47 autosomes

  • Has overall feminine development

  • Has gynecomastia

  • Has an additional copy of Y chromosome.

Which of the following is developed by parthenogenesis:

  • .Drones

  • .Queen Honey bee

  • C.Worker honey bee

  • .Both B and C

Match each item in Column I with one item in Column II and chose your answer from the codes given below:
Column I                          Column II
(genetic disorder)             (chromosome)
I. Sickle cell anemia           1. 11
II. Phenylketonuria             2. 12
III. Cystic fibrosis               3. 7
IV. Huntington’s disease      4. 4
Codes:
     I    II    III    IV
  • .  1    2     3     4
  • .  2    1     4     3
  • .  2    1     3     4
  • .  1    2     4     3   

Match each item in Column I with one item in Column II and chose your answer from the codes given below:
Column I                                      Column II
(two gene interacton)                   (F2 pheno. ratio)
I. Recessive epistasis                     1. 12 : 3 : 1
II. Dominant epistasis                    2. 9 : 3 : 4
III. Complementary genes              3. 9 : 7
IV. Inhibitory genes                        4. 13 : 3
Codes:
     I    II    III    IV
  • .  1    2     3     4
  • .  2    1     4     3
  • .  2    1     3     4
  • .  1    2     4     3

In Mendel’s experiments, the contrasting traits did not show any blending in:

  •  F1 stage
  •  F2 stage
  • Both F1 and F2 stages
  • The statement is false as blending was seen at all stages

What could be the genotype of a garden pea plant that expresses tall trait of height?

  • TD

  • Tt

  • Td

  • tt

A genetic cross between homozygous individuals but with different alleles for a single gene of interest is called as:

  • A reciprocal cross
  • Monohybrid cross
  • Dihybrid cross
  • Test cross

A graphical representation to calculate the probability of all possible genotypes of offspring in a genetic cross is called as:

  • Forked line diagram
  • Punnett square
  • Pedigree chart
  • Idiogram

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