def convert_fasta_case(seq_dict):
    """Loops over fasta dictionary and coverts all the fasta records
    to lower case.
    :param seq_dict (dict): a dictionary of fasta sequence IDs and sequences
    :return: a dictionary of fasta record
    """
    for k, v in seq_dict.items():
        seq_dict[k] = v.lower()

    return seq_dict