Online Test — Heredity
15 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 15
The transmission of characters from parents to offspring is called:
Variation
Heredity
Nutrition
Excretion
Explanation: Heredity is the passing of traits from parents to offspring.
Question 2 of 15
Differences in characters among individuals of a species are called:
Variations
Genes
Reflexes
Tropisms
Explanation: Variations are the differences among individuals of the same species.
Question 3 of 15
The units of inheritance that control traits are:
Genes
Neurons
Villi
Alveoli
Explanation: Genes, located on chromosomes and made of DNA, control traits.
Question 4 of 15
Mendel carried out his famous experiments on:
Garden pea plants
Mango trees
Mice
Bacteria
Explanation: Mendel used garden pea plants for his inheritance experiments.
Question 5 of 15
In Mendel's cross of pure tall and short peas, the F₁ plants were all:
Short
Tall
Medium
Half tall, half short
Explanation: All F1 plants were tall, the dominant trait.
Question 6 of 15
The F₂ ratio of dominant to recessive traits in Mendel's monohybrid cross was:
1 : 1
3 : 1
2 : 2
9 : 7
Explanation: The F2 generation showed a 3 : 1 ratio.
Question 7 of 15
A trait that is expressed (shows up) when present is called:
Recessive
Dominant
Acquired
Hidden
Explanation: A dominant trait is expressed and appears in F1.
Question 8 of 15
An organism with two identical alleles (e.g. TT) is:
Heterozygous
Homozygous
Recessive only
Variant
Explanation: Two identical alleles means homozygous (TT or tt).
Question 9 of 15
The sex chromosomes in a human female are:
XY
XX
YY
XO
Explanation: A human female has two X chromosomes (XX).
Question 10 of 15
The sex of a human child is determined by the:
Mother's egg
Father's sperm
Diet of the mother
Age of parents
Explanation: The sperm carries either X or Y, so the father determines the child's sex.
Question 11 of 15
All human eggs carry which sex chromosome?
X
Y
Both X and Y
Neither
Explanation: Eggs always carry an X chromosome; sperms carry X or Y.
Question 12 of 15
The gradual change in a species over many generations is called:
Heredity
Evolution
Reflex
Pollination
Explanation: Evolution is the gradual change in species over generations.
Question 13 of 15
A wrestler's strong muscles are an example of a/an:
Inherited trait
Acquired trait
Recessive gene
Sex chromosome
Explanation: Muscles built in a lifetime are an acquired trait, not passed to offspring.
Question 14 of 15
Forelimbs of humans, birds and whales have a similar structure but different uses. They are:
Analogous organs
Homologous organs
Fossils
Genes
Explanation: Similar structure, different function = homologous organs, indicating common ancestry.
Question 15 of 15
The theory of evolution by natural selection was proposed by:
Gregor Mendel
Charles Darwin
Isaac Newton
Robert Hooke
Explanation: Charles Darwin proposed evolution by natural selection.