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A major disadvantage of external fertilization is:

The Yucca plant is pollinated by:
1. an obligatory mutualist moth
2. an obligatory mutualist honeybee
3. a commensal moth
4. a commensal honeybee

The endosperm is usually completely consumed by the developing embryo in all the following except:

The duct of seminal vesicle opens into the:
1. Caput Epididymis
2. Cauda Epididymis
3. Ejaculatory duct
4. Vas deferens

At what stage of the follicular development does the primary oocyte complete its first meiotic division?

Suppression of sperm motility and their fertilizing capacity is the specific mechanism of action of:

Which of the following is a recessive trait in Pisum sativum?

Starch synthesis in pea seeds is controlled by one gene that has two alleles B and b. A heterozygote is expected to produce:
1. Large-sized seeds with a round shape
2. Intermediate-sized seeds with wrinkled shape
3. Intermediate-sized seeds with a round shape
4. Small-sized seeds with a round shape

A female with normal color vision but whose father was color-blind marries a color-blind man. What is the probability that their firstborn boy will be color blind?

In eukaryotes, RNA polymerase II transcribes:
1. heterogenous nuclear RNA
2. small nuclear RNA
3. transfer RNA
4. ribosomal RNA

During translation, formation of peptide bonds in bacteria is catalyzed by:
1. Polynucleotide phosphorylase
2. Protease
3. Ligase
4. Ribozyme

In the human genome, the chromosomes with the most and the fewest genes located on them respectively are:

All the following are a result of convergent evolution except:

‘Founder effect’ and ‘genetic bottleneck’ are associated with:
1. Stabilizing natural selection
2. Genetic drift
3. Assortative mating
4. Industrial melanism

'Living about 1.5 mya, with a brain size of about 900 cc, probably ate meat' – the description applies to:

The hormones that attain a peak level in the middle of the menstrual cycle include:

Both Hepatitis B and HIV infections:
1. are completely curable STIs
2. are caused by bacterial pathogens
3. can be transmitted by sharing injection needles
4. are preventable by vaccination

The ability to produce adventitious buds is exploited by gardeners for commercial propagation of:

Factors known to affect Hardy-Weinberg equilibrium include all except:

After the transfer of E.coli from ¹⁵N to ¹⁴N medium, the DNA extracted from the medium after 40 minutes will compose of:

A typical nucleosome contains:
1. 40 bp of DNA helix
2. 60 bp of DNA helix
3. 140 bp of DNA helix
4. 200 bp of DNA helix

β Thalassemia is controlled by:

The mode of inheritance of the trait in the given pedigree is most likely [affected individuals are shown by solid symbols]:

1. Autosomal recessive 2. Sex-linked recessive 3. Sex-linked dominant 4. Autosomal dominant

Fertilization in humans takes place most commonly in:
1. Oviduct – isthmus
2. Oviduct – ampulla
3. Uterus – fundus
4. Cervix

In bananas, fruits can develop without fertilization. Such fruits are called as:

Perisperm can be seen in the seeds of:

Thecodonts are thought to be the common ancestors to all the following except:

Speciation of Darwin finches on Galapagos islands is a prototypical example of:

A dihybrid test cross results in a 50% frequency of recombinants in progeny. This shows that:
1. The two genes are most likely located on different chromosomes
2. One of the genes must be located on the X chromosome
3. The two genes are closely linked on the same chromosome
4. The two genes must be pleiotropic

In the periodic abstinence method of natural contraception, couples avoid or abstain from coitus:

Encystation during unfavorable conditions followed by multiple fission and sporulation when favorable conditions return is seen in:

The number of chromosomes in a gamete of Ophioglossum is:

In an angiosperm, the structure that develops and becomes a pollen sac is called:

Central cell in a female embryo sac, after triple fusion, becomes the:

Seminal plasma mainly consists of contributions from all the following except:
1. Testes
2. Seminal vesicles
3. Prostate
4. Bulbo-urethral glands

Implantation in humans occurs:
1. at Morula stage, 4^th - 5^th day post fertilization
2. at Blastocyst stage, 4^th - 5^th day post fertilization
3. at Morula stage, 7^th - 8^th day post fertilization
4. at Blastocyst stage, 7^th - 8^th day post fertilization

Saheli, a non-steroidal oral contraceptive pill, was developed by scientists at:

The government of India legalized Medical Termination of Pregnancy in:

If the F₁ progeny in a monohybrid cross resembles both parents, most likely the alleles exhibit:
1. Incomplete dominance
2. Co-dominance
3. Complete dominance
4. Lack of segregation

The rediscovery of Mendel’s laws is credited to:
1. Morgan and Sturtevant
2. Knight and Goss
3. de Vries, Correns and Tschermak
4. Avery, Macleod and McCarty

The male honeybees:
1. do not have father and cannot have sons
2. do not have father but can have sons
3. do not have grandfather and cannot have grandsons
4. do not have father and do not have grandfather

A chromosomal disorder caused by a primary autosomal non-disjunction is:
1. Klinefelter's syndrome
2. Turner's syndrome
3. Down's syndrome
4. Conn's syndrome

What is incorrect regarding the salient features of the DNA double helix?
1. The two chains have anti-parallel polarity
2. The base pairing is complementary
3. Backbone of a strand is constituted by sugar-phosphate
4. The pitch is 0.34 nm

In the Avery, MacLeod, and McCarty experiment, transformation will not take place if the tube is treated with:
1. lipase
2. RNase
3. DNase
4. protease

The salient features of the human genome include all of the following except:

Coelocanth called lobefins evolved into the first:

The type of natural selection where more individuals acquire value other than the mean character value is known as:

Fitness in Darwinian terms is a measure of:

That formation of life was preceded by chemical evolution was proposed by:
1. Oparin and Haldane
2. Darwin and Wallace
3. Urey and Miller
4. Bernard Kettlewell

The size of VNTR [used in DNA fingerprinting] varies from:

The inducer of lac operon in E.coli is:
1. Repressor protein
2. Glucose
3. Lactose
4. Galactose

The radioactive isotope used to label the proteins of phage in Hershey and Chase experiment was:
1. ¹⁴C
2. ³⁵S
3. ³²P
4. ¹³¹I

In actual structure, the tRNA is a compact molecule which looks like:
1. a clover leaf
2. an inverted L
3. a beta pleated sheet
4. an alpha helix

The initiation and termination factors required for prokaryotic transcription are respectively denoted as:

The mRNA codon UGG is the codon for amino acid:

A woman is of blood type A. Her daughter is type O and her son is type B. Which of the following is a possible phenotype for the father?
1. A
2. O
3. B
4. AB

A couple has a son. What is the probability that their next child will be a daughter?
1. ½
2. 1
3. 0
4. ¼

Identify an autosomal recessive inborn error of metabolism the effects of which can be completely overcome by regulating the diet of the affected individual:

A trait displays continuous phenotypic variation and is spread across a gradient. Usually, the inheritance of this trait can be described as:
1. dominant-recessive inheritance
2. multiple-allele inheritance
3. polygenic inheritance
4. sex-linked inheritance

In translation, the enzyme amino acyl-tRNA synthetase:

The process of transcription and translation can be coupled in:

A male can be infertile if:

The onset of puberty in humans coincides with a significant increase in the secretion of:

A hormone secreted by the placenta and used in pregnancy to develop fetal metabolism and general growth and development is:

During a menstrual cycle, the part of the female reproductive system that undergoes the greatest changes is the:

The most accurate sequence of hormones secreted during a typical menstrual cycle will be:

During embryonic development, which of the following structures actually differentiates into the embryo?

Identify the hormone that helps in parturition by its action on uterine smooth muscles and also in lactation by its action on myoepithelial cells:

The fetus body is covered with fine hair, eye-lids separate and eyelashes are formed by the end of:
1. One month of pregnancy
2. Two months of pregnancy
3. Three months of pregnancy
4. Six months of pregnancy

IVF may be used to overcome infertility due to: 

Surgical interventions like tubectomy and vasectomy block:

The menstrual cycle is seen in the females of all the following except:

Corresponding to ‘monoecious’ in a plant, the bisexual condition in a fungus would be best described as:

‘Germ pore’ in pollen in angiosperms:

Dioecy in flowering plants prevents:
1. autogamy but not geitonogamy
2. geitonogamy but not autogamy
3. both autogamy and geitonogamy
4. neither autogamy nor geitonogamy

When a plant grows from an embryo, the embryonic organ that persists for the entire life of the plant is:

Seed formation is a more dependable reproductive strategy in angiosperms because:

Cellular thickenings called filiform apparatus are seen in:

Wind-pollinated flowers are characterized by the following, except:

In a population in genetic equilibrium, the frequency of the recessive allele is found to be 0.2. What is the frequency of heterozygotes in this population?

“An Essay on the Principle of Population” that possibly influenced both Darwin and Wallace was written by:
1. JBS Haldane
2. T R Malthus
3. Eldregde and Gould
4. Georges Cuvier

At the time of the origin of life, the primeval earth's atmosphere most likely did not have significant amounts of:

The predominant site for control of gene expression in prokaryotes is:
1. Transcription initiation
2. Binding of mRNA to ribosome
3. Translation termination
4. Post translational modification

The untranslated regions [UTR] in mRNA:

In a transcription unit, the template and coding strands are defined by:
1. The structural gene
2. The promoter
3. The terminator
4. The operator

During DNA replication, the discontinuously synthesized fragments are joined by the enzyme:
1. Polynucleotide phosphorylase
2. DNA polymerase
3. DNA ligase
4. Restriction endonuclease

The first genetic map of a chromosome was constructed by:

The number of cells in ‘Morula’ varies between:

The functions of male sex accessory ducts and glands are maintained directly by:
1. GnRH
2. Gonadotropins
3. Testicular androgens
4. Adrenal medullary androgens