def METHOD_NAME(spec, validator_balances, activation_threshold):
    deposit_root = b'\x42' * 32
    eth1_block_hash = b'\xda' * 32
    previous_version = spec.config.GENESIS_FORK_VERSION
    current_version = spec.config.GENESIS_FORK_VERSION
    if spec.fork == ALTAIR:
        current_version = spec.config.ALTAIR_FORK_VERSION
    elif spec.fork == BELLATRIX:
        previous_version = spec.config.ALTAIR_FORK_VERSION
        current_version = spec.config.BELLATRIX_FORK_VERSION
    elif spec.fork == CAPELLA:
        previous_version = spec.config.BELLATRIX_FORK_VERSION
        current_version = spec.config.CAPELLA_FORK_VERSION
    elif spec.fork == DENEB:
        previous_version = spec.config.CAPELLA_FORK_VERSION
        current_version = spec.config.DENEB_FORK_VERSION
    elif spec.fork == EIP6110:
        previous_version = spec.config.DENEB_FORK_VERSION
        current_version = spec.config.EIP6110_FORK_VERSION
    elif spec.fork == EIP7002:
        previous_version = spec.config.CAPELLA_FORK_VERSION
        current_version = spec.config.EIP7002_FORK_VERSION
    state = spec.BeaconState(
        genesis_time=0,
        eth1_deposit_index=len(validator_balances),
        eth1_data=spec.Eth1Data(
            deposit_root=deposit_root,
            deposit_count=len(validator_balances),
            block_hash=eth1_block_hash,
        ),
        fork=spec.Fork(
            previous_version=previous_version,
            current_version=current_version,
            epoch=spec.GENESIS_EPOCH,
        ),
        latest_block_header=spec.BeaconBlockHeader(body_root=spec.hash_tree_root(spec.BeaconBlockBody())),
        randao_mixes=[eth1_block_hash] * spec.EPOCHS_PER_HISTORICAL_VECTOR,
    )
    # We "hack" in the initial validators,
    #  as it is much faster than creating and processing genesis deposits for every single test case.
    state.balances = validator_balances
    state.validators = [build_mock_validator(spec, i, state.balances[i]) for i in range(len(validator_balances))]
    # Process genesis activations
    for validator in state.validators:
        if validator.effective_balance >= activation_threshold:
            validator.activation_eligibility_epoch = spec.GENESIS_EPOCH
            validator.activation_epoch = spec.GENESIS_EPOCH
        if is_post_altair(spec):
            state.previous_epoch_participation.append(spec.ParticipationFlags(0b0000_0000))
            state.current_epoch_participation.append(spec.ParticipationFlags(0b0000_0000))
            state.inactivity_scores.append(spec.uint64(0))
    # Set genesis validators root for domain separation and chain versioning
    state.genesis_validators_root = spec.hash_tree_root(state.validators)
    if is_post_altair(spec):
        # Fill in sync committees
        # Note: A duplicate committee is assigned for the current and next committee at genesis
        state.current_sync_committee = spec.get_next_sync_committee(state)
        state.next_sync_committee = spec.get_next_sync_committee(state)
    if is_post_bellatrix(spec):
        # Initialize the execution payload header (with block number and genesis time set to 0)
        state.latest_execution_payload_header = get_sample_genesis_execution_payload_header(
            spec,
            eth1_block_hash=eth1_block_hash,
        )
    if is_post_eip6110(spec):
        state.deposit_receipts_start_index = spec.UNSET_DEPOSIT_RECEIPTS_START_INDEX
    return state