Mcqs on Genetics
What phylum do insects belong to?
A) Annelida
B) Arthropoda
C) Mollusca
D) Nematoda
Answer: B) Arthropoda
Which class do spiders belong to?
A) Arachnida
B) Insecta
C) Crustacea
D) Myriapoda
Answer: A) Arachnida
What is the largest class in the phylum Mollusca?
A) Gastropoda
B) Bivalvia
C) Cephalopoda
D) Polyplacophora
Answer: A) Gastropoda
Which phylum includes animals with a notochord, dorsal hollow nerve cord, and pharyngeal slits?
A) Arthropoda
B) Chordata
C) Echinodermata
D) Platyhelminthes
Answer: B) Chordata
Which group of invertebrates is known for its radial symmetry and a water vascular system?
A) Cnidarians
B) Poriferans
C) Echinoderms
D) Annelids
Answer: C) Echinoderms
In which class would you find animals with jointed appendages and an exoskeleton made of chitin?
A) Arachnida
B) Crustacea
C) Insecta
D) Myriapoda
Answer: B) Crustacea
What is the primary characteristic of animals in the phylum Porifera?
A) Jointed appendages
B) Radial symmetry
C) Soft bodies
D) Pore-bearing bodies
Answer: D) Pore-bearing bodies
Which class of invertebrates includes organisms with a segmented body and exoskeleton?
A) Arachnida
B) Insecta
C) Crustacea
D) Annelida
Answer: D) Annelida
What is the main distinguishing feature of arachnids?
A) Antennae
B) Wings
C) Jointed legs and body segments
D) Eight legs
Answer: D) Eight legs
Which phylum includes animals with stinging cells called cnidocytes?
A) Mollusca
B) Arthropoda
C) Echinodermata
D) Cnidaria
Answer: D) Cnidaria
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What is the molecule that carries genetic information in cells?
A) RNA
B) Protein
C) DNA
D) Lipid
Answer: C) DNA
In a DNA molecule, adenine pairs with:
A) Cytosine
B) Thymine
C) Guanine
D) Uracil
Answer: B) Thymine
The term “allele” refers to:
A) A type of RNA molecule
B) Different forms of a gene
C) A protein involved in DNA replication
D) A specific chromosome
Answer: B) Different forms of a gene
What is the phenotype of an organism?
A) Its genetic makeup
B) Its observable traits
C) The ratio of dominant to recessive alleles
D) The total number of genes
Answer: B) Its observable traits
Mendel’s law of segregation states that:
A) Alleles for different traits segregate independently of each other
B) Alleles for the same trait segregate during gamete formation
C) Dominant alleles always mask recessive alleles
D) Alleles are inherited as a mixture and do not segregate
Answer: B) Alleles for the same trait segregate during gamete formation
Which genetic disorder is caused by the presence of an extra chromosome 21?
A) Hemophilia
B) Down syndrome
C) Huntington’s disease
D) Cystic fibrosis
Answer: B) Down syndrome
What is a Punnett square used for in genetics?
A) Determining the phenotype of an organism
B) Predicting the outcomes of a genetic cross
C) Analyzing gene expression
D) Identifying mutations in DNA
Answer: B) Predicting the outcomes of a genetic cross
In a dihybrid cross, how many different allele combinations can be produced in the offspring?
A) 2
B) 4
C) 6
D) 8
Answer: D) 8
What is the role of tRNA in protein synthesis?
A) Transcribing DNA to RNA
B) Carrying amino acids to the ribosome
C) Initiating translation
D) Acting as a structural component of the ribosome
Answer: B) Carrying amino acids to the ribosome
What is the probability of having a male offspring if the father carries the Y chromosome?
A) 0%
B) 25%
C) 50%
D) 100%
Answer: D) 100%