Biology

Heredity and Evolution

374+ practice questions available

Sample Practice Questions

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Easy

Case Study: Sex Determination In humans, sex is determined genetically. Females have two X chromosomes, and males have one X and one Y chromosome. The Y chromosome is generally smaller than the X chromosome. During gamete formation, each egg receives one X chromosome, while sperms can receive either an X or a Y chromosome. What is the probability that a child will be a girl?

A25%

B50%

C75%

D100%

Easy

Assertion (A): Humans and chimpanzees share a common ancestor. Reason (R): They have similar DNA sequences and homologous structures.

ABoth A and R are true and R is the correct explanation of A

BBoth A and R are true but R is not the correct explanation of A

CA is true but R is false

DA is false but R is true

Medium

The law of independent assortment applies when genes for two traits are located on:

AThe same chromosome close together

BDifferent chromosomes or far apart on the same chromosome

COnly sex chromosomes

DMitochondrial DNA

Hard

A population of beetles has green and brown variants. A bird predator easily spots green beetles on brown soil. Over generations, the percentage of brown beetles increases. If the soil colour suddenly changes to green (due to vegetation growth), what would happen?

ANothing — the beetle population would remain mostly brown

BNatural selection would now favour green beetles, and over time the population would shift towards more green beetles

CAll beetles would immediately turn green

DBrown beetles would learn to change colour

Medium

Transitional fossils are important because they:

AAre the most common type of fossil

BShow features intermediate between two groups, providing evidence of evolutionary links

CAre found only in the deepest rock layers

DProve that evolution does not occur

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