The water vascular system is unique to which phylum and plays what primary role?

The correct answer is A: Echinodermata; locomotion and feeding. Echinoderms possess a unique water vascular system derived from the coelom, used for locomotion, feeding, and respiration through tube feet.

Which of the following molluscs possesses a radula?

The correct answer is B: Snail. The radula is a ribbon-like feeding structure with teeth found in gastropods (snails) and many other molluscs, used for scraping food.

The blood-brain barrier is primarily composed of which type of cell?

The correct answer is A: Astrocytes and endothelial cells. The blood-brain barrier is formed by tight junctions between endothelial cells of brain capillaries, supported by astrocytes that regulate nutrient transport and maintain the barrier's integrity.

Among vertebrate classes, which one shows the transition from aquatic to terrestrial life with specific embryonic membranes?

The correct answer is B: Reptilia. Reptilia (and subsequent classes) show the complete adaptation to terrestrial life with amnion, chorion, and allantois. Amphibia still requires water for reproduction.

A new allele arises in a small island population of 100 individuals. The allele frequency is 0.02. Over the next 10 generations without selection, what is most likely to happen?

The correct answer is A: The allele will be lost due to genetic drift. In small populations, genetic drift can cause alleles to be randomly lost. With frequency only 0.02 in a population of 100, the allele is vulnerable to random loss.

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NEET Zoology
Genetics & Evolution

Zoology questions for NEET UG — Animal Kingdom, Human Physiology, Genetics, Evolution.

27 Q 6 Topics Take Mock Test

Difficulty: All Easy Medium Hard 11–20 of 27

Topics in NEET Zoology

All Animal Kingdom 100 Human Physiology 100 Genetics & Evolution 100 Reproductive Health 100 Ecology & Environment 100 Biotechnology & Applications 40

Q.11 Easy Genetics & Evolution

In human genetics, the ABO blood group is determined by multiple alleles. A person with blood type AB has which genotype?

A IAIA

B IBIb

C IAIB

D ii

Correct Answer: C. IAIB

EXPLANATION

Type AB blood group is codominant, expressed as IAIB, where both IA and IB alleles are expressed equally.

Test

Q.12 Easy Genetics & Evolution

A cross between two pea plants produces offspring in the ratio 1:2:1 for a particular trait. This ratio suggests:

A A monohybrid cross between two heterozygous parents

B A testcross between heterozygous and homozygous recessive

C A monohybrid cross between homozygous dominant and homozygous recessive

D A cross between a heterozygous and homozygous dominant

Correct Answer: A. A monohybrid cross between two heterozygous parents

EXPLANATION

1:2:1 ratio indicates Aa × Aa, where offspring are 1 AA : 2 Aa : 1 aa. This is the typical F2 ratio for a monohybrid cross.

Test

Q.13 Easy Genetics & Evolution

Which of the following statements about mutations is INCORRECT?

A Mutations are random changes in DNA sequences

B Most mutations are beneficial for organism survival

C Mutations can be induced by UV radiation and chemicals

D Silent mutations do not change amino acid sequences

Correct Answer: B. Most mutations are beneficial for organism survival

EXPLANATION

Most mutations are either neutral or harmful; only rarely are they beneficial. This is a key principle in evolutionary biology.

Test

Q.14 Easy Genetics & Evolution

In Drosophila, the gene for white eyes (w) is X-linked recessive. A white-eyed female is crossed with a red-eyed male. What will be the phenotype of F1 females?

A All red-eyed

B All white-eyed

C Half red-eyed, half white-eyed

D All white-eyed with red spots

Correct Answer: A. All red-eyed

EXPLANATION

White-eyed female (XwXw) × red-eyed male (XWY). F1 females receive Xw from mother and XW from father, making them XWXw (red-eyed carriers).

Test

Q.15 Easy Genetics & Evolution

Homologous structures in different species indicate:

A Convergent evolution

B Divergent evolution from common ancestor

C Parallel evolution

D No evolutionary relationship

Correct Answer: B. Divergent evolution from common ancestor

EXPLANATION

Homologous structures are similar due to common ancestry with modification over time—classical evidence for divergent evolution.

Test

Q.16 Easy Genetics & Evolution

A couple plans to have children. The man is a carrier for cystic fibrosis (Aa) and the woman is homozygous normal (AA). What is the probability their child will have cystic fibrosis?

A 0%

B 25%

C 50%

D 75%

Correct Answer: A. 0%

EXPLANATION

Cross AA × Aa produces AA and Aa offspring only. Cystic fibrosis requires aa genotype, so probability is 0%.

Test

Q.17 Easy Genetics & Evolution

In pea plants, yellow seed (Y) is dominant over green (y). If a cross produces 75% yellow and 25% green seeds, what was the genotype of the parents?

A YY × yy

B Yy × Yy

C YY × Yy

D Yy × yy

Correct Answer: B. Yy × Yy

EXPLANATION

3:1 ratio (75% yellow : 25% green) is characteristic of monohybrid cross between two heterozygotes (Yy × Yy).

Test

Q.18 Easy Genetics & Evolution

Which of the following evolutionary evidences is based on the study of vestigial structures like human tailbone and wisdom teeth?

A Molecular evidence

B Anatomical/Comparative morphological evidence

C Paleontological evidence

D Chromosomal evidence

Correct Answer: B. Anatomical/Comparative morphological evidence

EXPLANATION

Vestigial structures are anatomical remnants that indicate common ancestry with other organisms, supporting comparative morphology evidence.

Test

Q.19 Easy Genetics & Evolution

A man with blood group AB marries a woman with blood group O. Their children will have blood groups:

A A and B only

B A, B, and O only

C AB and O only

D All four groups

Correct Answer: A. A and B only

EXPLANATION

Man (IAIB) × Woman (ii) produces IAi (Group A) and IBi (Group B) offspring only. O group requires ii genotype.

Test

Q.20 Easy Genetics & Evolution

A cross between a homozygous tall plant (TT) and homozygous dwarf plant (tt) produces F1 generation. When F1 is self-pollinated, the ratio of tall to dwarf plants in F2 will be:

A 3:1

B 1:1

C 9:3:3:1

D All tall

Correct Answer: A. 3:1

EXPLANATION

F1 (Tt) self-pollination gives 3 tall (TT, Tt, Tt) : 1 dwarf (tt) ratio following Mendelian monohybrid cross pattern.

Test

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Genetics & Evolution